This glitch will make your characters be able to jump twice as much as you currently can. For example, if you don't have the double-jump relic, you are able to jump twice with this glitch and if you have it, you are able to jump up to four times. This glitch is useful for sequence breaking and getting items early in the game.

1)First have both characters on the same screen
2)Tap the touch screen above to make your partner jump up to two times (depending if you have the double jump ability or not)
3)Once your partner is high enough, press X to switch characters
4)If timed correctly, you will be able to do an extra jump or two right after switching characters