About the final bosses attack in the subspace

[GameFanR]

How do you avoid that one wave attack that the final boss unleashes on you,the attack that will automatically kill you.

[Josh]

Shield-roll when it comes near you, that's what most people do.

[Uglygorilla]

you could always sidestep or just shield-roll just like josh said.

[Prime]

You can also avoid it by switching pokemon with the Pokemon trainer.
The way I always do it is sidestep though.

[isaacforbrawl]

you could do a sidestep dodge or shield roll.

or you could be pkmn trainer or zelda and transform.