DeltaCalc 3.1.0 — Patch Notes

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TL;DR

• Megas now actually mega — base stats, types, AND ability. Holding Charizardite Y makes the calc read Drought + 159 SpA. Mawilite makes Huge Power double Atk. Pixilate fires on Mega Gardevoir's Hyper Voice. All 47 Gen 6-7 megas covered on both sides.
• Strong Winds works. Flying defenders no longer take 2× from Ice / Rock / Electric while Parasol Prayer or Delta Stream is on the field.
• Return / Frustration = 102 BP. No more friendship-guessing.
• Facade no longer cut by burn. Bypasses the 0.5× physical Atk drop in addition to doubling base power.
• Database overhaul. 303 variants (Ursaluna, Zapdos, Moltres, Aegislash, every Mega, every regional, every typed Arceus) were silently mapping to the wrong form. Fixed.
• 7 new mons scraped from Discord — Sevygarde, Hydrapple-Ultra, the Applin-Ultra family, Trapinch-ATOM — with sets baked in.
• Curated TR Cresselia set replaces the OU defensive default.
• Gigantamax removed — not in the Delta pack.

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Mega Evolution — finally works

Three separate bugs collapsing into one bad experience: the calc would silently use base-form numbers when it should have used mega numbers. All three are fixed across four versions.

Pre-mega: holding the stone, haven't pressed mega-evolve

Player or opponent is holding a mega stone the calc has identified. The calc now commits to the mega form immediately — base stats, types, intrinsic ability — without waiting for the mega evolution to actually fire. Applies symmetrically to both sides.

Previously: only the opponent got the swap. The player snapshot respected partyPokemon stats, which silently downgraded the calc when (a) the player hadn't pressed mega-evolve yet or (b) Cobblemon's post-switch-in visual glitch reverted the sprite to base form.

Post-mega + switch-out + switch-in (the Cobblemon visual glitch)

Cobblemon has a known issue where a mega's sprite reverts to base form on switch-in even though the species is still mega. The form tracker now preserves the mega state across switches (FormTracker.clearCurrentForm gained a keepPermanent flag; switch/drag cleanup uses it), and player-side actualStats re-derive from mega base stats so the visual glitch can't downgrade the calc.

Stats source — the DB, not Cobblemon's aspect lookup

The v0.9.1.4 trump rule was sourcing mega base stats via species.getForm(setOf("mega-x")) — Cobblemon's PokemonSpecies aspect API. For Charizard X/Y (and likely other megas), Cobblemon's actual aspect name doesn't match "mega-x" / "megax", so the lookup silently returned the base form and the swap bailed.

The calc now reads mega base stats from the bundled battle database first. It has hand-verified entries for every Gen 6-7 mega:

Form	HP / Atk / Def / SpA / SpD / Spe
Charizard-Mega-X	78 / 130 / 111 / 130 / 85 / 100
Charizard-Mega-Y	78 / 104 / 78 / 159 / 115 / 100
Gardevoir-Mega	68 / 85 / 65 / 165 / 135 / 100
Mawile-Mega	50 / 105 / 125 / 55 / 95 / 50
...all 47 entries

DB hit short-circuits the Cobblemon aspect path entirely. The aspect path is kept as fallback for species missing from the DB, with a widened candidate list (mega_x, x, mega-form, megaform).

Ability also swaps (0.9.1.6)

The big one. The DB has mega base stats and types, but doesn't carry abilities. A hand-verified MEGA_ABILITY_BY_FORM_KEY map fills that in for all 47 Gen 6-7 megas:

Mega	Ability		Mega	Ability
Charizard X	Tough Claws		Charizard Y	Drought
Mewtwo X	Steadfast		Mewtwo Y	Insomnia
Gardevoir	Pixilate		Altaria	Pixilate
Lopunny	Scrappy		Mawile	Huge Power
Medicham	Pure Power		Kangaskhan	Parental Bond
Salamence	Aerilate		Pinsir	Aerilate
Scizor	Technician		Heracross	Skill Link
Lucario	Adaptability		Beedrill	Adaptability
Aerodactyl	Tough Claws		Metagross	Tough Claws
Sharpedo	Strong Jaw		Manectric	Intimidate
Blastoise	Mega Launcher		Sceptile	Lightning Rod
Tyranitar	Sand Stream		Garchomp	Sand Force
Steelix	Sand Force		Abomasnow	Snow Warning
Glalie	Refrigerate		Houndoom	Solar Power
Camerupt	Sheer Force		Pidgeot	No Guard
Banette	Prankster		Absol	Magic Bounce
Sableye	Magic Bounce		Diancie	Magic Bounce
Gengar	Shadow Tag		Slowbro	Shell Armor
Latias / Latios	Levitate		Aggron	Filter
Ampharos	Mold Breaker		Gyarados	Mold Breaker
Audino	Healer		Alakazam	Trace
Venusaur	Thick Fat		Blaziken	Speed Boost
Swampert	Swift Swim		Gallade	Inner Focus

All the ability-conditional engine paths fire automatically — Tough Claws on contact, Pixilate's Normal→Fairy + 1.2×, Mega Launcher's pulse boost, Huge Power's 2× physical Atk, Solar Power's 1.5× under sun, Strong Jaw's 1.5× on bites, etc.

Opponent item-cycle UI now surfaces mega stones

Charizard's item cycle now shows Charizardite X and Y as options. Same for Gardevoir → Gardevoirite, Mawile → Mawilite, all 45 mega-capable Gen 6-7 species. Previously the cycle only included usage-derived items plus a generic common-items list, so most megas required usage data to surface them. Cycle limit raised 8 → 10 to make room.

Hard constraint

The trump rule only fires for items in the mega-stone table. No other item type overrides Cobblemon's live state.

Asymmetry to know about

• Opponent ability still respects manual cycle overrides — if you cycled to a specific ability, trump won't undo it.
• Player ability is overridden unconditionally (no manual cycle exists on player side).

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Calc engine (0.9.1.3)

Strong Winds (Parasol Prayer / Delta Stream)

When either active Pokemon has Parasol Prayer or Delta Stream, super-effective-vs-Flying multipliers (Ice / Rock / Electric, 2×) are clamped to neutral on Flying defenders. Per-type, so dual-type Flying defenders still take normal damage from their non-Flying type (Rock 2× × Flying 1× = 2× total on a Rock/Flying defender from an Ice move).

Move tooltips flag the active state with "Strong Winds (Flying SE → neutral)".

Return / Frustration

Both calculate at 102 BP. The calc can't read friendship values, and competitive sets always max it, so this matches Showdown.

Facade vs. burn

Facade now correctly bypasses burn's 0.5× physical Atk drop in addition to doubling its base power. Previously these cancelled to 1× — burned Facade hit like normal Facade. Fixed.

Guts trigger hardened

Only fires on recognized status names (burn / poison / paralysis / sleep / freeze + aliases) instead of any non-null status string.

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Database (0.9.1.3 → scrape day)

Variant alias overwrite (303 species)

Massive lookup bug: every variant entry listed the base species name in its aliases. The old indexer let those aliases overwrite the base species' lookup key, so "ursaluna" resolved to Ursaluna-Bloodmoon, "zapdos" to Zapdos-Galar, "aegislash" to Aegislash-Blade — silently wrong stats on hundreds of species.

A two-pass indexer (primary identifiers first, aliases via putIfAbsent) now guarantees a variant's alias can never override its base species. Resolves:

• Ursaluna defaulting to Bloodmoon
• Zapdos / Moltres defaulting to Galar
• Decidueye defaulting to Hisui
• Camerupt defaulting to Mega
• Basculegion defaulting to F
• Aegislash defaulting to Blade
• Every Mega, regional, Gigantamax-tagged, typed-Arceus variant

7 new mons scraped (custom-pokemon channel)

Previous snapshot was 2026-03-31. Re-scraped to catch everything released since:

Mon	Type	BST	Notable
Sevygarde	Poison/Ground	600	Seviper × Zygarde, Season 7 ranked reward, Shed Skin
Hydrapple-Ultra	Poison/Dragon	540	Spoiled Goods / Regenerator
Trapinch-ATOM	Water/Bug	528	Hyper Cutter / Strong Jaw
Dipplin-Ultra	Poison/Dragon	485
Appletun-Ultra	Poison/Dragon	485	Thick Fat
Flapple-Ultra	Poison/Dragon	485	Hustle
Applin-Ultra	Poison/Dragon	260	Bulletproof

Curated competitive sets

• Cresselia — Trick Room replaces the OU defensive default. Levitate, Relaxed, 252 HP / 252 Def, Mental Herb > Leftovers, Trick Room / Moonblast / Psychic / Lunar Dance.
• Hydrapple-Ultra — AV Regenerator, Modest 244 HP / 252 SpA / 12 Spe, Fickle Beam / Sludge Bomb / Earth Power / Giga Drain. 25% Nasty Plot alt move, 20% Spoiled Goods alt ability.
• Sevygarde — Defensive utility, Careful 248 HP / 252 SpD / 8 Spe, Thousand Arrows / Toxic / Haze / Rest. 40% banded Adamant alt spread.

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Removed

• Gigantamax handling — not in the Delta pack. Message handler, signature-move bypass-ability entries, and translation key all removed. Dynamax handling kept intact.

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Internal / dev notes

• Strong Winds extracted as isStrongWindsHolder helper; DamageContext.strongWindsActive flag threaded into the type-chart loop.
• Mega-form lookup factored into a shared computeMegaSwap helper used by both applyMegaFormSwap (opponent) and the new applyPlayerMegaSwap (player).
• CalcBattleSnapshotFactory.derivedHeuristicStats exposed as internal so the mega swap can re-derive actualStats from new base stats.
• FormTracker.clearCurrentForm gained a keepPermanent flag; StateUpdater switch/drag cleanup now uses it so mega entries survive switch-outs.
• MEGA_STONES_BY_SPECIES (45 entries) drives the item-cycle prepend so every mega-capable species surfaces its stone(s) without depending on usage scrape coverage.
• MEGA_ABILITY_BY_FORM_KEY (47 entries) carries the intrinsic ability lookup since the DB doesn't store abilities.
• DB indexing changed from single-pass put to two-pass (primaries first via putIfAbsent, aliases second). Affects both species map and Delta-ranked set map.
• BattleDatabase.findSpecies lookup chain for mega forms keys on <species>-mega(-x|-y)? to match the data-pipeline's slug convention.

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Known limitations

• Weather-setting on switch-in isn't automatic. Pre-mega Charizard Y shows Drought as its ability but won't auto-set sun in the calc until the actual mega-evolve message fires. Same for Drizzle / Sand Stream / Snow Warning megas. Set the weather manually if you need Solar Power / sun-boosted Fire damage modeled.
• Player mega stats lose precise IV/EV/nature investment. The trump rule re-derives player actualStats heuristically from mega base stats. Within damage-roll variance for typical mega spreads; accepted trade-off vs. silently calc-ing base stats.
• Two species still need a repro: Cresselia base form and Pincurchin both have clean DB entries with no alias collisions — if you're still seeing wrong data, please drop specifics.
• Gigantamax-tagged dead data remains in the auto-generated database files. Harmless without the code paths reaching it; will be stripped on the next full data-pipeline run.