The Legendary Starfy how do you beat mashtooth?

On the first part, you need to spin attack him.NOTE: you will take 2 hitpoints away from Mashtooth when you jump over him and do a Shooting Star. When he charges, jump over him and do a spin attack. To Dodge lightning, the tiny bolts that don't hurt you warn you where the big bolts are gonna be, so just go in an area where the small bolts aren't. Run as fast as you can when he tries to suck you up threw his nose, jump over or spin at the rocks that will hurt you. Now when you pass the first part of the boss, your on the part where he's big! You have to see where the small bolts are again to see where the big ones are and stay out of the warning areas. Try you're best to hit Mashtooth on the head, and when he shoots asteroids at you, DON'T just try to dodge him. You have to try to use your spin attack on the asteroids because they will hit Mashtooth and immediately drop a whole hit point which speeds the boss up. After you beat part 2, that's not it. He shoots a huge asteroid at you twice, and you have to press Y real fast so you better have a quick thumb. If you get tired, take a few breaks by pressing pause, and before you resume, place your thumb back on the Y button so you're ready. Or if this does not work get a friend and switch out every once and awhile. I hope this helps, that's what I did.