>>30601159ninetales is 81 bst and starmie is 100
EVs play a big part as well, representing about 30 potential points at level 50
but neither of those are going to hit the power of pokemon like alakazam and gengar who have bst 135 and 130 respectively
the power of the move you're using, whether or not its a STAB move, some items you can hold, all change the damage, if you just want to play through the game, those are fine pokemon, if you want to battle competitively, special sweeper won't be their default niche