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and don't get me started on the points of no return in the climax - you can't grind (besides level 40 porygons) and your only shot for reliable EXP is non-rematchable trainers
keep in mind that the game expects your party to be around level 50 when you enter, but it intends you to have a level ~55 team for the confrontation with FUCKING SILVER and the ensuing bossfight against a bullshit level 60 mewtwo with 5 health bars
also, if quads, then birds are even more important