Legends Of GalaxAra :
Xtreme Ball Adventure
Monster Power (MP for short) is the power of the Monster Transformation ability , without MP , you will not able to Transform to a monster.
Why is there a limited MP ?
On the story , The monsters fall on a planet called (X-Cluctra) , Rat-Demon (Real name : Rath devel) , who is a Mad-Evil scientist and controls the planet , invented a machine called (Hydro-Magnic Pulse Machine) , this machine emits a Pulse called (Hydro-Magnic Pulse) that effects on Organic creatures , and made an effects on them , some creatures turns into balls (Like the game heroes) , other can have a special powers or become stronger or weaker etc.
Some creatures which been effected by the Hydro-Magnic Pulse can transform back to there Original form but with a limited power like our heroes , and they can charge there power back by turn back into there Hydro-Magnic forms (Ball forms for our heroes).
Things that needs MP
Almost every thing you make on the original form needs MP expect walk , jump and Speed Attack (Dash Attack)
Thanks for your time