Mega Man X2/Sub Tanks

Wire Sponge Stage
When you see a flying platform, step to the first one at very top and then dash jump to the left, then jump right to the next platform and you found the sub-tank here!

Flame Stag Stage
Wait the first flying beetle come and aim the flying beetle to the very top and step on the top of their body (not head) and jump to the left and you score a sub-tank here!

Magna Centipede Stage
Right before to the mini-boss room, there is a gap in the ceiling, make sure when the multiple boxes fall, quickly pass over it and then when another one box fall, ride it and quickly dash jump to the right to score a sub-tank.