It might be good if it's done to everybody, but if they just start now gen 6 Pokemon will be horribly disadvantaged compared to older Pokemon that still have access to a whole ****load of moves (Especially gen 4, when you factor in some of the tutors it's like they threw balance out the window).
Some of the gen 5 guys actually seem like attempts at this. Klinklang, Leavanny, Lilligant...there's way more. Some of them probably got better with B2/W2, as well.
I summoned a baby to attract a lion. It didn't seem to work, so I tried a delicious baby. Regular baby ATE delicious baby. Horror....horror.~Gameplayingperson
Gen V got screwed over really bad. First time where not all the starters had access to Earthquake, a commonly widespread move. Zekrom missed out on Earthquake too. Water types like Seismitoad and Keldeo couldn't even use Ice Beam. What made it more weird was how Seismitoad couldn't use Waterfall or Dive like all the other Gen V water types. Lilligant, Serperior, Klinklang and Zebstrika have extremely barren movepools mostly filled with STAB moves limiting much needed coverage. This was Gamefreak's attempt at scaling movepools back and this didn't turn out well for a lot of the new Pokemon.