I need any cheats that would be useful for Bowser's Galaxy Generator!!..

I don't know you're precise area of trouble (such as the drill mario with bullet bills, the lava wall with the speed pepper, or bowser himself), so I will give you a short, general walkthrough.

Follow the Luma, then defeat the three Hammer Bros. When you defeat them, a plant thing (I forgot what it's called) will show up. Spin near it, then jump on it. Head down the lava path, avoiding the fireballs when possible. Getting too low? Spin to go a little higher. Use drill mario to get to the next planet.

Here you will need to get past the big bullet bills without getting hit, else you will lose your drill and can't go on until you go back and get another one.

Next, you have to time your jumps to get on the moving platforms. Grab the cloud flower, and do a series of backflips and spinning to get to the launch star. Beware, those bullet bill can destroy the clouds you make, and if they hit you, you will lose the cloud flower and fall.

Head across the bridge, defeat the Magikoopa, the on the tettering platform, head reight to get Yoshi, then go left using Yoshi's tounge ability. The path with the Boomerang Bro leads to a 1-up if you need it. Careful on the other path, because columns of lava can spew out and burn Mario and Yoshi.

Defeat the Boomerang Bros, grab the speed pepper, and run before the wall closes in and crushes you. On the moving platform, avoid the lava monsters that show up out of the lava. A huge one will show up; grab the Blimp fruit to avoid it. The rest is pretty straight forward.