I have a coupple of questions: 1.How many health and what level is Groudon?

1)Can't remember his HP-you don't find out his level until after you catch him (or any of the Pokemon's levels), but it's lower then that when you first reach him.
2)Well, if you had a Water type & attack I'd say yes most likely, since those are super-effective. Grass type and Ice type attacks are your next best bets. Absol can learn Ice Beam and Blizzard. Make sure you let the others besides Cyndaquil get into a position to be able to attack him, too, since they're your main strength. Limit their moves to only the best ones, and have Cyndaquil throw things like sticks and iron thorns, etc., as they'll do a decent amount of damage. Try maybe linking up some moves with a link box just before you get to him so you get more turns than Groudon does, just make sure you have the PP or Max Elixirs!! Also, Special and Power bands are great for upping your Sp. Attack/Attack-12 points!
3)After you beat Groudon, next is Sky Tower and Rayquazza-the last mission in the Main Story line, but I'd take some time to do some missions & leveling up for that journey! You'll need those Ice moves for him especially!
OK, I only answered because I have friends who dig Naruto-next time I want to see a Pokename or no soup for you! LOL! Kidding! Who cares what your name is-we're not biased here, or at least I'm not. (But everyone knows that Pokemon blows Naruto away anyway, so no big deal.) If you hadn't apologized I'd never have even noticed probably...All I play pratically is Pokemon, but my name doesn't show it-it's that name because I like it!! It's a nickname in my real life, too, and in all my games. [What's in a name? If not called a rose would the flower still smell as sweet?-my bad version of good poetry-LOL]

Around 30 something, I don't know exactly but he's strong. Bulbasaurs razor leaf will be usefull and if absol has ice beam it would be perfect.

Just be strong, cruising the dungeon will level you up. To 30 or 35

Then you need to beat rayquaza after defeating groudy.

Groudon is at level 27 and has 500 HP. Bulbasaur and his grass-type moves will do very well, but I think he has Fire Blast, so watch out!!!! Then you'll go to Sky Tower (25 floors) and fight Rayquaza after going through S.T. Summit (9 floors), he is Lvl. 35 and has 600 HP!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Train hard for this fight and teach Absol Blizzard or Ice Beam.Also, your name is okay, mine's Mario!!!!!