Divekick Cancel Wallclimb

Once we get double jump and therefore divekick, we can utilize some animation cancel shenanigans to infinitely climb any solid wall that we can find. Divekick immediately changes our aerial momentum to the direction we're divekicking in, and we can instantly cancel divekick into an aerial attack to not lose vertical height from it.

So to break it down, a divekick cancel wallclimb would look like;

1. Make contact with the wall in question

2. Walljump off of said wall

3. While holding back towards the wall, press the heavy button to begin a divekick in that direction

4. Immediately after, cancel the divekick in an aerial attack and move back to the wall

5. Repeat steps 2 through 4 until the desired height is reached

Lab Wallclimb Skip

In R'lyeh in particular, we can take advantage of the wall just before the Berserker squad boss fight to wallclimb our way up and avoid the fight entirely.