Ok...you have to choose the red table and you have to go to Seafoam Islands. There you can find Horsea, Staryu, Seel and Articuno, but Articuno is pretty rare. To get to the Seafoam islands, you have to make a map move. What I find out so far about 'map moves':
Map Moves
If you hit a diglett, psyduck, or poliwag button 3 times, you can go on to a little bonus called a map move. Map moves allow you to change the city you're in. If you get 3 map moves sucessfully, you'll move on to hard to reach areas so you can catch new pokemon! It's very difficult, but if you want to complete your pokedex, you have to do it!
Sounds completely stupid, doesn't it? Well, I'm not sure if the Seafoam islands aer one of those hard to reach areas, but I think so. Hm, I guess that's all I can tell you, but I also found out how to catch Pok�mon at the red table, I bet everyone is laughing at me now, but I'll still tell ya! *proud*
1. Get the pinball to go the whole way around the right loop. Each
time it goes through to the loop, it will light a Catch 'em Arrow.
2. Once you get at least 2 Catch 'em Arrows lit, shoot the pinball
into the Bellsprout. This will start the Catch 'em Mode.
3. There will be a silhouette of the Pokemon you can catch on the
Pokemon Panel, and you have 2 minutes to catch it. Launch the ball at
the Voltorbs. Each time you hit a Voltorb, it reveals 1/6 of the
picture. 6 hits will reveal the whole thing.
4. Once you complete step #3, the Pokemon will appear. Hit the Pokemon
3 times to reveal the word "CATCH!" (In the Japanese version, it was
the word "GET").
5. Now hit the creature 1 more time to capture it.