PokéBase - Pokémon Q&A
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I heard it at level 50.I can be wrong
And i also heard that schooling will activate when wishiwashi is sent out in water area(encountering pokemon while surfing,diving or fishing) or while raining in battle.

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3 votes
Best answer

At level 20 Wishiwashi will get the ability schooling. Then it can turn into school form. However, if its hp drops below 25% it will turn into a normal Wishiwashi for the rest of the battle.

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1 vote

Starting from Lvl 20 Schooling can be formed.

I have a Wishiwashi in Pokemon Sun and I can confirm it can use its Schooling ability at Lvl. 20.
this pokemon is A-MAZING!!!!!!!!!!!!! definatly use it!!! (but yeah level 20)