>>32309113Gen 1 mewtwo, historically, is the strongest mon of its generation of every generation.
Basically because there were no other main legendaries but it.
If we are talking about ou, T-tar may have been top-threat for 3 generations, but Snorlax was so good in its goldeen age that got basically its own tier in ''Snorlax-rank''. Scizor also has been top usage for 5 years, from platinum 'till BW2.