not to mention surf on blaze... what are you trying to hit? something blaze can hit harder without surf? (rock? ground? what you trying to hit?)
imo the new gen is well balanced; even with the addition of new abilities and movesets the old pokes meerly become "usable" rather than "imba"
regarding somersault: disagreed on my account, you stil need to outspeed your opponent to avoid gettin hit, and your tag takes the punishment instead just like any other switch/pass, not to mention they don't recieve your stat bonuses (if they did, yes, overpowered indeed, however stat uppers are countered regularly even with old hazers, so the problem isn't anything glaring)
stuff worth mentioning:
rdosaidon - rhydon was already decent, but they gave it an evolution and an ability that lets it survive what would've been OHKOs... if it had changed types to dual steel would've been really broken
trait: psychic dream - and on hypno and jynx no less, there will be a decline in tauntmentors if this trait literali allows you to see their movesets... this isn't imba, but if simply bringing in the pokemon can allow you to see their movesets, alot of the current stratergies being employed to do this will be dropped (sigh... no more umbreon...)
item: full stomach incense - attacks first, enough said