I found 3 glitches, 1 in Power Plant and 2 in Seafoam Islands
Power Plant: There's a Voltorb Pok?ball who doens't disapear after battle, it remains and you're able to "talk" with him again, but is impossible to replay the battle.
Seafoam Islands 1#: If you use Strenght in the boulders of the entrance and push until the hole, if you out of the dungeon, (no matter if you exit by the entrance or use dig) when you back, the boulder is disapeared, if you fall in the hole, the boulder will not be there, the boulder no spawn again on the entrance of the dungeon (like the original Red and Blue) and if you haven't save stated before or saved ingame after that, you will get stuck in this dungeon, but we still can go to cinnabar through surf south of pallet town, and through east of cinnabar we can enter on the exit of Seafoam to get Articuno.
Seafoam Islands 2#: Sometimes I attempt to use Surf by press A on the water like Pok?mon 2 Generation and it say that my Pok?mon (with surf) can not surf in that water, but when I open the start menu, and I go to pok?mon, select my Pok?mon and select surf, it works.
I want to make a video to demonstrate that. Please wait, coming soon...
I would like to remember the Sucker Punch Glitch, this move didn't work at all, if the player uses, game freezes, if the NPC uses, always miss.
https://www.youtube.com/watch?v=O1wQyoj6o6g
Oh, just one question, why the girl sprite has a long hair in game sprite, long hair in the title screen, long hair in the status screen, BUT when start a battle she has short hair? I didn't get it, the old one battle sprite seems better, besides don't looks like a second generation sprite.