Torterra's moveset is fine, although healing moves generally aren't advisable on casual movesets. Ain't like Torterra has many better options; Rock Slide or Stone Edge are available, but I s'pose Synthesis isn't exactly useless and therefore doesn't entirely warrant a change.
IMO, Lucario in casual battling is best utilized as a mixed attacker, pickin' at whatever the foe's lower defensive stat is in the case it can't score a super-effective hit. Flash Cannon and Dragon Pulse are very redundant moves. Lucario can learn Ice Punch via Tutor t' absolutely destroy Dragons. Flash Cannon doesn't actually offer any coverage, you'll only ever use it against Poison-types or somethin' over Aura Sphere. Despite the Jolly nature, I'd recommend teachin' it Close Combat. Lucario isn't bulky as is, so those Defense drops (which are easily cured with a switch) aren't of too much consequence. Furthermore, havin' dual STAB; one Physical, one Special; lets ya plow through the opponent once you get rid'a whatever Pokes'a theirs resist Fighting. If ya don't like Close Combat, Lucario does have other options, albeit lesser ones. Stone Edge, Psychic and Dark Pulse are available. Regardless of what moves ya prefer, ya definitely want t' replace Flash Cannon and Dragon Pulse.
Hypnosis would be great t' use over Milotic's Hydro Pump (it's a Specially bulky 'mon, not an attacker, doesn't need those high BP, low PP moves), but that's an egg move... If ya teach Lucario Ice Punch, ya could drop Ice Beam and Hydro Pump for Toxic and Protect. Combine that with Leftovers and Milotic will stall out pretty much any Special attacker bar potent Electric-types. ToxiStall is a very undervalued tactic in casual battles.
crobat sux lulz replace it w/ lugia/dragonite
'Specially when he doesn't have access to Egg moves, it loses it's two biggest assets: STAB Brave Bird and it's fame as bein' the fastest user of Hypnosis in the game. If you're dead set on keepin' it, I'd really recommend breedin' one with a better nature (it's Physical Poison STAB is just too low base power, it needs Sludge Bomb) and at least Brave Bird. Otherwise it'l be the least useful member of your team by a long shot.
Thunder and 'specially Strength are relatively unwanted moves. Focus Blast is nice coverage, although Lucario's Aura Sphere still hits harder. Thunder Wave spreadin' Paralysis lets your slower members, 'specially Torterra and Amphy itself, get the jump on foes. Charge Beam is a meh option only 'cause Ampharos ain't got the largest movepool, as it's too slow t' make much use of that boost for too long. Alternatively, by using Sleep Talk and Rest, Ampharos can spread paralysis like crazy between Discharge and Thunder (both moves have a 30% chance of inflictin') while also dealin' some heavy damage. Milotic is arguably better at ResTalking since it's bulkier and has better typin', but it can't know Hypnosis and Scald isn't a Gen 4 move.
Dragon Rush sucks lol. If ya want power, use the (accurate) Outrage. If you hate Outrage for some reason, just use D-Claw. D-Rush is simply terrible and needs t' be replaced. Garchomp doesn't need t' hit Ghost-types, so Shadow Claw should be replaced. Garchomp is your strongest attacker and is even ya second fastest Poke. As such, Swords Dance would be a fantastic move for it. If your Ampharos spreads paralysis to the opposing team's faster Pokes, Garchomp will have an even easier time cleanin' up. Good synergy amongst the two movesets' strategies.