Have some screenshots and stuff.

Pokemon Crystal to Pokemon Blue

Pokemon Blue to Pokemon Crystal

This is what Azuzeus.DMP looks like. It might have been in color if I had put it into Pokemon Crystal instead, but who cares.
Additionally, here's some screenshots of me trying to put Sentret in other games (and failing due to not knowing how the VRAM works.)

Donkey Kong Land 2. Nothing interesting here that I can see, although I think bits of Sentret's tail might be in there.

Kirby's Pinball Land. If you look closely, you'll see there's a chopped up Sentret on the bottom left portion of the screen.

Ant Soldiers, which I think is just some homebrew Lemmings clone. As you can see the icons at the bottom have been replaced with chopped up pieces of Sentret.

Link's Awakening. Again, nothing to see here, move along.

Pokemon Blue in the overworld. Once again no interesting sights.

Pokemon Trading Card Game. I think the things replacing the damage counter symbols are Sentret's left ears.

Super Mario Bros DX. The flag is now made of Sentret's face.

And finally, Tony Hawk's Pro Skater 2. To be honest I didn't really expect anything interesting due to my results with all the other games but it was the last one that I could be bothered to test.