What are all the IN-BATTLE form(e) changes that aren't triggered by an ability?

Question

Please don't waste your time listing all of the Pokemon that mega evolve using a mega stone.

Answer 1

Meloetta can change forms during battle without needing a special Ability. Instead it uses its signature move, Relic Song. Cherrim changes form in the sunlight. I suppose Mew, Smeargle and Ditto (non-Imposter) can also change via Transform, but I don't know if that counts as a form change.

Primal Groudon and Kyogre change forms when they hold the Red an Blue Orbs, respectively, however like Rayquaza this could be counted as a Mega Evolution-esque transformation.

>What about mega ray? Form change technically, and it can be triggered by knowing dragon ascent
commented 18 minutes ago by Đarkheart

Source

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As for Pokémon that change with Abilities…

Zoroark changes appearance via Illusion.
Darmanitan changes form via Zen Mode.
Castform changes form via Forecast.
Ditto changes form (?) via Imposter.
Aegislash changes form via Stance Change / King's Shield.

Comments

Don't forget Keldeo

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What about mega ray? Form change technically, and it can be triggered by knowing dragon ascent

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um...that's it?

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@Sep: It changes to Resolute Form outside of battle.
@Darkheart: I guess so, since it doesn't hold a Mega Stone
@sumwun: Yep. All the rest are ability-based.

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That makes everything a whole lot easier.

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Shoot! I can't believe we forgot primal reversions!

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On it.