Big bang 4d Pegasis modes

Hey guys. Just got my son a big bang 4d pegasis and he cant even hang with my Nemesis. Can someone advise what would be the best mode to last a long time in a battle? Thanks in advance
Unfortunately no mode will work. Big Bang Pegasis, especially uncustomized, is simply bad. The F: D 4D Bottom cannot be used competitively, it has too little stamina.

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