>>53241895alright let me actually categorize this
>can transform or at least appear as another pokemonditto, zorua, zoroark
>multiple cosmetic formsunown, spinda, burmy, shellos, gastrodon, basculin, deerling, sawsbuck, vivillon, furfrou, xerneas, minior, magearna
>no direct attacking moveswobbuffet, pyukumuku
>learns sketchsmeargle
>split evolutions based on chance when generated (personality value, gender, etc)wurmple, burmy
>detrimental abilityslaking, regigigas
>unusal evolution methodshedinja, milotic, malamar, meltan
>hardcoded statsshedinja
>multiple forms with different typingscastform, wormadam, rotom, shaymin, arceus, darmanitan, kyurem, meloetta, genesect, hoopa, oricorio, silvally, necrozma
>weather-related form changescastform, cherrim,
>can change type in battlekecleon, greninja
>multiple non-cosmetic forms without different typingsdeoxys, cherrim, giratina, tornadus, thundurus, landorus, genesect, greninja, aegislash, pumpkaboo, gourgeist, zygarde, lycanroc, wishiwashi, minior, mimikyu,
>gender locked evolutionswormadam, mothim, vespiquen, salazzle
>could play custom audiochatot
>only obtainable by breeding a mythicalphione
>can be fusedkyurem, necrozma
not real gimmicks: minmaxed stats, comically awful stats & movepool, being awful until evolved, being a giftmon, being out of the way, being event only/mythical, being rideable in a single game, having an unusual dex order placement, or any signature moves/abilities
dishonorable mention goes to delibird, audino, gogoat, and toucannon for having no actual gimmick whatsoever despite OP including them in this image