Pixeldots are 4Bytes*1.
Fly hack (by Zirak)
76 12 04 00 00 f0 6d 27 =>
76 12 04 00 00 f0 6d 26
No flying limit (by Zirak)
66 a0 08 d1 a0 68 a0 08 =>
66 a0 08 47 a0 68 a0 08
Adjust speed
24 ?? 68 9d 08 =>
24 ?? 68 9d 08
Change the second "??" to whatever you want. The limit is 127 (7f).
I can't seem to get the "no flying limit" to find any results for some reason, but with the "fly hack" it doesn't really matter until you actually get wings and the hack stops working.
Also, just in case it matters, make sure if you're going to increase pixeldots that you don't give yourself 100%; if you need 32 dots, giving yourself 32 will make the next dot increase your total to 33/32, and you will not evolve. Each dot will simply increase your current dots. As such, always set the value to, at most, 1 lower than the upper limit so you can easily and quickly evolve by getting 1 pixeldot. If the Speed Run medal actually worked, it would be very easy to get it using this method.