i've always found suicune to be a bit of a waste unless you're abusing spikes. otherwise, slowbro is just as good for being a bulky water, and can thunder-wave, and has an effective, albeit gimmicky, move for blissey/snorlax (dynamicpunch).
hyper beam is pretty messed up in gsc compared to rby. it takes an accuracy hit, and i think it still takes a turn to reload even if you kill on the turn it is used. don't hold me to that though. regardless, it's not nearly as useful as it was in rby. double-edge/body slam make more sense on dragonite.
you have 3 ground weaknesses, but i suppose with suicune and dragonite, it's not TOO terrible. just be careful with being too predictable on the dragonite switch, or the opponent could get bold and start firing off rock slides.
typhlosion is very versatile, so it could use anything in that last slot. i suggest, however, to drop quick attack, as its uses are very limited in gsc. in adv it can be fun to take out flailers, but in gsc, it's quite worthless. thunderpunch is a nice option for water switch-ins. earthquake can be used as well for a strong physical move. dynamicpunch as well for expected blissey/snorlax switch-ins (two very popular special walls).
Jolteon is my favorite electric, legendary or not. I use sub/baton pass/hidden power(water)/thunderbolt, but our two uses of jolteon seem different. regardless, getting a hidden power water/ice on it would be a good idea, if you can. if not, you could use agility/sub/baton pass. Jolteon doesn't get much to use. Sand Attack could be an option as well. Maybe even Attract (the early standard).
Heracross is cool. rarely do you see one with 3 attacks though. typically people choose two attacks (Megahorn+whatever) and use Sleep Talk/Rest, since Heracross has decent defenses a few nice resistances. It's a pretty sturdy pokemon. It's up to you, though.
Rhydon definitely needs Rock Slide. For the last two slots you could do...Curse/Roar/Rest. Any combo of those two, pretty much. Rhydon is very limited as well in its movepool. Even moreso than Jolteon, even.
the team is lacking firepower in a way. rhydon and heracross are both ready to rip some things up at the outset, but many teams pack something that sets up in some way. you have good team defense, and with good prediction i don't think that 3x ground weakness will hurt too much.
