1 ) Yes, that's correct.1. you say after round three we have to, so starting round 4 we have to use the changed pokes.
2. For round 4 and on, can we choose to use the ones from rounds before and use that to count towards the necessary changed poke?
3. I think there should be more changes to pokemon which are actually ou, instead of pokes from lower tiers which are perceived to do well with these changes.
there is no firemage tournament on pokecommunity server