>>53158065The reason is probably more akin to Explosion's power always being intended to be that great originally, it's just that representing it as a base power value was tricky due to programming limitations or something, as one byte's max value can be 256, and 250 still fits neatly within that. So they doubled its effective power beyond that by adding a defense-halving property. Then they eventually nerfed the move to the ground by removing it.
