I improved level 45 with a new strategy.
A couple lag frames were lost on level 47 though, that level has a lot of really random lag.
Also I made it GBA mode for potential console verification.
ThunderAxe31: I want to note that this movie desyncs on BizHawk 2.5.2, but that's just because of file format incompatibilities. I was able to make it sync on 2.5.2 after fixing some info in the header of this movie file. So, for this movie, both 2.4.2 and 2.5.2 are perfectly accurate to the real console, as it was confirmed thanks to CasualPokePlayer.
I also want to note that this movie uses the GBCinGBA mode, which results in a shorter BIOS screen than the current publication, which used GB mode. In cases like these, the difference in length of the BIOS screen is not accounted when comparing the two movies; only actual gameplay differences are used for comparison, and since this submission features a gameplay improvement, it's considered a proper improvement.
Movie contents are almost the same, so this should inherit the same tier as the current publication.
Accepting for Moons as an improvement over GB The Bouncing Ball by KiwiCracker, brunovalads in 08:23.96.