Can I lol that Abra is tired from using Teleport. I got so angry in Red (the original!) when I was trying to catch that damn Abra! It kept teleporting!

Shockwave that Slowpoke, then, use a Shadow Ball on Gastly and finish off by using Shockwave again on Slowpoke.

Staryu, use your Shadow Ball on Gastly, then Thunderbolt Slowpoke and finish off with using Psychic in Beam form on Gastly.