I started to play a little pokemon leaf green rom and found out how to make a new ride. You need to be in this exact location and have the walk through walls cheat on. Then you get back on deck you have a new ride. You can try this move many other ways. P.S. I got a shiny Mew. ... https://www.youtube.com/watch?v=O4v3Pgt-M_Q
The shortest time I've seen for this level is 3:18 (by Area9000) so I guess this is a world record. This run was played on an emulator but I'm pretty sure the same trick used at the end of the run can be done on a PS2. There are also other tricks I know of but are too hard to replicate.
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https://www.youtube.com/watch?v=dUF4eDperMo