Super Mario Maker glitch lets you center bigger enemies on a single tile

Coming from Reddit user, Jonahhl...

To place any 2x2 enemies such as Thwomps, Bowser, or giant variations of enemies in a 1 tile width space, simply place a 1x1 enemy such as a goomba underneath the giant one to create a tower. This centers the 2x2 enemy to stand on top of the goomba. Now place a podoboo, or fireball, on top of the goomba, so it takes the goomba's place, getting rid of it. Enemies don't stack on podoboos, so you can simply delete the fireball and the giant enemy will remain centered. This can be used to place a giant enemy on a 1 tile area such as a pilla.

Also worth noting, you can use this trick to achieve the same goal in reverse to place a 1x1 enemy in between 2 blocks.