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Is Rayquaza good for Zam Raids?
Only against the Focus Blast moveset
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Like gluglumaster said, good in windy. And by good I mean #1 DPS good. You can pretty easily do C/FB with 6 level 30 Rays in windy weather with a bit of dodging.
In neutral, at level 40 Rayquaza is barely acceptable as a filler that stays even with the clock (180s TTW) if you had Mewtwos/Gengars earlier to get ahead of the clock.