Is chimecho a rare Pokemon and is my team good Like rayquaza and kyogre..

1 I don't like double kick take it off if you want to and replace with foucus punch.
And chimecho is rare but not that rare.

Man, you have an amazing team! And no, Chimeco is not that rare. It's hard to find (i haven't caught one yet!), and once it is raised properly with good moves, it turns our to be a great fighter.
But now about you team. Its good because it's a mix of different Pokemon. Your not like one of those people who collects rare Pokemon and rare Pokemon only! BLAZIKEN's moves are great! Your Blaziken's moves are similar to mine (Mine are Double Kick, Dig, Overheat and Blaze Kick) AND FOR ALL YOU PEOPLE OUT THERE WHO THINK THAT DOUBLE KICK IS A BAD MOVE, WELL IT'S NOT! DOUBLE KICK IS MY BEST MOVE FOR MY BLAZIKEN! ITS GREAT FOR THE POKEMON LEAGUE ESPECIALLY WHEN YOUR UP AGAINST SIDNEY, GLACIA AND STEVEN!!!!!!!! SO STOP DISING DOUBLE KICK BECAUSE ITS A FANTASTIC MOVE!
Now that i've got that out of the way, onto the next Pokemon.
MACHOKE's moves seem really good, but try taking it one step further. Instead of Dynamic Punch, try Cross Chop. Its a strong move. Also, it would be good if you evolved your Machoke. Trade it with someone in order for it to evolve into a Machamp, and then trade it back.
Your KYOGRE looks powerfull, and seems like a good fighter, but it is only 19 levels higher than when you first catch it at level 45. Maybe if you could get your Kyogre up to at least level 70, you would have a pretty darn good team!
METAGROSS's moves are good, but there is no need for it to hold a King's Rock. Give it the EXP Share, so it can be leveled up with the other Pokemon in your team.
RAYQUAZA looks great. It doesn't need to hole a Shell Bell though. I would give the Shell bell to a Chimeco.
AGGRON is a really good Pokemon to have on your team! Well done! I just think that you don't really need double edge. It hits you with recoil. Maybe if you replaced that with something like earthquake, it would be good.
Out of 10 I rate your team 8
You should be proud of yourself for having such a fantastic team. Congratulations.
And GO BLAZIKEN! ITS BLAZIKEN ALL THE WAY!!!!!

noob using legendaries

Chimecho is rare however not legendary.I have one and personally do not use it just had it for the pokedex entry. Now about your pokemon. This is from perspective of battle tower. Blaziken moveset is good dfor a baton passed poke. Blaze kick and sky upper cut are dope but I'd add some other physical attacks to balance it like slash and overheat instead of ember for an emergency special attack. Use also a critical hit boost hold item. Machoke I'd dump off you're squad because you got blaziken for fighting and a physical attacker.. Perhaps a gardevoir or alakazam... Even chimecho even though I think it's weak :P you need a Pokemon with special attack and a variety of a moveset and gardevoir thunderbolt psychic is a true dominator :D. I personally hate using legendary ubers like kyogre so I'd replace it with a gyarodos or waillord.. Gyarodos literally pwns ass just watch out for electricity because of 4x super effective .m. Metagross... Get rid of rock smash and use a safe guard/light screen you need more party boosting moves otherwise it's dope! As I said.. Hate ubers (rayquaza) so I'd swirch it for a salamence or flygon! Altaria is also dragon/flying and a beasty mofo! Use dragon dance dragon claw flamethrower and thunderbolt for those hatin ass ice Pokemon moves ;3. Last but not least I'd trade out aggron for a ludicolo because of his awesome move set and sombrero. Okay too lazy to get into hold items so good luck