Pretty surprised all things considering that they are programming effects (meaning all of this was captured and recreated in some form, they can't be ripped in the traditional sense). Had it been ripped, there would have been just that one tile shown in the tile viewer in game (a black tile located in 8FF0). The Pokéball effect is also one tile too (located 8FE0).

Having just checked the game (first time playing a Pokémon game for a looooong time), the ripper edited the effect due to the Game Boy only has 1 background layer manually removing the tileset and not using a background viewer due to the trainer sprites being there. The last one also has a palette effect without the palette to go with it and still has leftovers from the first Trainer Battle and the tileset, it's also very hard to use.

I know this is impossible to add in this sheet, but I'm pretty sure there is another encounter transition simply being the screen distorting.

better than nothing i guess

A bit of editing? More like a lot of editing.

I agree with Ton, a bit of editing would make them much easier to use.

I feel like the backgrounds should be edited out of these.