alright, well the hyper beam tm should definitely go to snorlax. body slam he learns naturally iirc. selfdestruct is a tm. and surf is an HM. Surf works well on Golem/Rhydon, especially because the Earthquake tm should go to charizard. Otherwise, you can use pretty much whatever you want for that 4th move.
Snorlax-Hyper Beam, Body Slam, Selfdestruct, Surf
i think golem learns earthquake on its on, so the earthquake tm can go to charizard. he also gets the swords dance tm. i think he eventually learns fire blast, but if not there is a tm for that. as far as his 4th move goes...maybe Fly? If it's yellow, maybe Wing Attack. or perhaps Body Slam, since Snorlax gets that naturally. Rock Slide could also be a nice choice.
Charizard-Swords Dance, Fire Blast, Earthquake, Fly/Body Slam/Rock Slide?
Starmie gets the Thunder Wave TM. Surf is an HM and Blizzard is a TM. Recover it learns. Now, thunderbolt is iffy. Gengar probably needs it just as much. But it would be nice to be able to handle other waters with your own water. It's up to you.
Starmie-Thunderwave, Recover, Blizzard/Surf, ???
Gengar learns hypnosis. Explosion could be better served on golem or eggy. So...confuse ray is an option. Psychic is an option (nice for opponent special falls, but not so nice because psychic is a major type in competitive battling. seismic toss is good. mega drain is ok for golem/rhydon. Since Starmie has great options for its 4th move even without thunderbolt (2 of psychic, blizzard/ice beam, surf), thunderbolt could possibly be better served on gengar. your choice.
Gengar- Hypnosis, Seismic Toss, Mega Drain??, Psychic??, Thunderbolt??
Golem is pretty simple. Substitute is a TM. Earthquake and Rock Slide (i think) are learned naturally. Explosion is a must.
Golem- Rock Slide, Substitute, Earthquake, Explosion
Exeggutor is easy enough. No explosion (unless..does it learn it naturally? i highly doubt it) so that means it can double powder (stun spore and sleep powder) as well as get double stab (psychic and mega drain). Or, if you want, Double Edge over Sleep Powder to handle Alakazam better (alakazam is a popular psychic type).
Exeggutor- Sleep Powder/Double-Edge, Stun Spore, Psychic, Mega Drain