Why doesn't Nintendo make a Pokemon Super Smash Bros.?

[theARTIST0017]

Crazybone126 said:
Put it this way you are never going to see a franchise specific SSB. Sakurai created Smash because he and Nintendo wanted to see all the Nintendo all-stars battle it out.

That link has already been broken with TMNT: Smash Up and yeah maybe Sakurai isn't directing it but members from the Smash team are helping to make it.