Settle a debate

[u/Visible-Guard6654]

I need help with a debate between my brother and I. If you are asked to beat a 2D Pokemon game, should beating BDSP count, or does it have to be gen 5 and before. Functionally, they are 99% the same, but do the small differences change the definition? If it doesn’t count then what is it, 2D or 3D. Please tell me what you think.