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Y is the first time I caught em all.
I probably had them all between my red, blue and yellow games (except mew) and managed to get 338/386 in LG, using AR to get deoxys, celebi and mew.
Y seemed so easy, I was nearly at the oval charm by the time I beat the E4 and collected a bunch of safaris and after that bank filled the gaps and giveaways got the diancie.