Super Buu.

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Super Buu is one of the main villians in Dragon Ball Z: Reincarnation.

Transformations
[These are being estimated by my brain together, right now, Super Buu, has the powerlevel of Chibi Gohan]

Super Buu + Krillin 220m

[Chibi] Gohan + Super Buu 400m

Super Buu + Exodius (Kaioken) 660m

Super Buu + Krillin, [Chibi] Gohan, and Exodius 840m