Brief description:

1. Freeze the rinka

2. stand next to the zebetite, and hold [Left] and [Run]

3. get damaged (by the zeb, or another rinka, or a small projectile)

4. after getting damaged, do a VERY SLIGHT, VERY LOW Spinjump, and land. You have to do this DURING your i-frames from getting damaged (which is when you are flickering/transparent)

5. IMMEDIATELY after landing, hold [Left] and [Run], and LIGHTLY TAP [Jump] until you get through. This will allow you to be "standing" on the zebetite, almost inside of it, and repeatedly tapping will let you clip through.

This takes a little bit of finesse, a lot of practice, and a lot of getting used to. Don't give up, you can do it!