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I disagree on it tho :/

Choice-locked is always usable, isn't it?

**Fletchinder**: Fletchinder can come in easily on the defensive set and set up a Swords Dance if Dragon Tail isn't present. Choiced sets that lock into Earthquake can also be set up on.

that's where I saw it, I think it's fine in a case like this

I think in this case that 'Choice sets' is just as good. Nevertheless, 'Choiced' is probably the 'least bad' of all the things said--it's not really AGAINST the rules to use it.