Who is the best character to beat boss battles on very hard and intense?

CHARIZARD ALL THE WAY!
His side B attack takes massive chunks of damage if you time it right.I killed Master hand in three hits once!I got through very hard with charizard went to intense mode had a 10 minute battle with tabuu and just like twilightprince...I...sadly...lost.*sniff*

It depends:
Lucario is good for gaining damage and using it powerfully
Ike is superstrong and has an Counterattack
Marth is fast and has a counterattack
Kirby has a good float ability and can get in there quickly
Those are your best choices but if you are good with a certain character feel free to use him

Well you probably might wanna go with your best character. I recommend Pit since he has great jumping abitlites and offense power.

Charizard. Use his forward B attack to beat bosses in a fraction of the time it would take with anybody else. If you time it right, you should take off massive amounts of lives (you'll actually see the health bar decrease which is not true for other character's attacks).

Use Pokemon Trainer and chose charizard to use first.
Use his Rock Smash which does a good amount of damage to the
Bosses.

I managed to get all the way to Tabuu but was killed by his Wing Attack.

SONIC ALL THE WAY!!!!! He is super fast and his up close combat monuvers kick some major ***!

I agree with everyone else here. I personally used Kirby and his mid-air Side B to do lots of damage.

Ness and Lucas!I got to last boss with Ness. I got to the boss before the last boss with Lucas.

Well I beat very hard with mario
Haven't beat intense

Bowser is the master on intense boss battles, just use the uppercut on the air or press B while running to the boss. It's like playing easy mode.

Any "heavyweight" character. This includes those big guys like Charizard, Bowser and DK. You might use a character with a counterattack like Lucario. I prefer Lucario.

On boss battles very hard mode I did it with the Pokemon Trainer (Charizard/Squirtle). Use Charizards rock smash constently (over B move) on the following bosses. Master hand, Crazy hand, Galleom, Duan, Ridley, and Porkey. I use Squirtle on Tabbu, Raquasa, Meta Ridley, and Petty. I only could do this on very hard difficulty.

I would say Ike because he's superstrong even though he's kinda slow

Charizard ike and ganondorf for me

Lucas becuse you can use pk thunder and pk fire for long rang and he
Can reflect.

yoshi.
he doesn't get knocked back easily plus have the egg attack for distance attacks many enemys have the nasty habit to get away and tries to keep the distance. and if you get close use the A down attack while in mid air to preform massive dammidge, and if the boss is hig in the air and you time it you can preform 2 sometimes three A donw in midair to do massive damage. good luck.

well roys the best because I have all charactars

Peach is the best you have to have great timing but with her b+side and aerial dodge with a little help from toad (B), you can beat boss battles on intense and take little to no damage. Not to mebtion by using b+up and hovering you have really long air time and recovery distance. Petey, ridley, porky, golleom, master hand, crazy hand, meta ridley, duon, and tabuu can't touch me! Watch out for Rayquaza though...

Pikachu because he's fast has a little bit past average power can reach ANYWHERE and he can attack right after he attacks I almost beat tabuu with pikachu but I decided to goof around

Marth Lowell is the best. He has a one hit kill- final smash. He is easy to use and he slashes his sword so fast! His up b is perfect unless you are too far away from land, hit up b at the wrong time an then die. His jumps are good, and I like the dancing blade.not his best attack, but still really cool. Not to menschon, his speed. He sprints, which is fun if you are in a hurry. He has always been my #1 all time favorite. In SSBB, I think he uses the Devine blade. I am not sure, I haven't played fire emblem in a while. And yes, I would choose him over Ike any day. I beat tabuu with him. Boss battles aren't hard with him. Especially Bowser.