well, if this is only in-game, i wouldn't worry too much about skarmbliss, since i doubt many of your friends would use that combo. and, since you have a lot of electric coverage (rhydon immunity, meganium resistance, raikou resistance, snorlax just being a special sponge + rest), why not go with another water over heracross' spot? tentacruel is a really fun pokemon to use in gsc with surf/hydro pump, swords dance, sludge bomb, and substitute(to block status, and since it is resistant to quite a few moves). it's a great pokemon to bring in on a spiker and lay a sub down since neither cloyster or forry could do anything to him. or charizard would fit in that last spot pretty well, too. something like belly drum, earthquake, fire blast, rock slide/some other physical attack.