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My list include:
Demonbane
Tengen Toppa Gurren Lagann
Getter Emperor
Mazinger Zero
Granzon/Neo Granzon
Cybuster
SRX/Banpreios
Dis Astranagant
Shurouga
Zelvoid
Mazinkaiser (SRW Original)
Shin Getter Robo
Getter Arc
Star GaoGaiGar/Genesic GaoGaiGar
Mazin Emperor G
King J-Der
Ideon
Gunbuster
Diebuster
Dix-Neuf
Dancouga
Godmars
Naked Jehuty
Anubis
Valzacard
Zeorymer/Great Zeorymer
Weltall/Weltall-Id
Xelguard
And many others from SRW, anime, manga, etc.

BP is supposed to have a crust of heavy metal at least a hundred miles thick, probably a lot more. How many of these mechas can get through that, let alone defeat the multidimensional mystery inside? BP probably wins.