Pokémon Gold and Silver/Union Cave

'When you first visit Union Cave, you probably won't be able to use Surf and Strength, which you need to use to get around the entire cave. You will be able to explore the first floor and the middle portion of the first basement. Talk to everyone you see. Some people have very interesting information.'

Catch a Sandshrew
If you have not had a chance to catch a Phanpy (in crystal only), catch a Sandshrew, which is also a great ground type Pokémon. Unfortunately, he does not learn an ground type attack by leveling, then it will need TMs. Mud-Slap, Dig (which can be picked up later) and Earthquake are good choices.

Take a short detour for TM 39
This cave is pretty simple: just head south, fighting the trainers when you must and picking up items where you can. But if you have the fortitude to handle a short detour, take the stairs on the high ledge to the left. You won't get far in the basement, but you can easily get to TM 39. It contains Swift, a strong Normal attack that always hits and can be learned by most Pokémon.

Take the back doors to the ruins
If you're planning to continue your exploration of the, make sure to go through the two exits near the top of Level 2 (you'll need to have Surf to reach them). Each one leads to a different part of the Ruins of Alph that is otherwise inaccessible.

Level 3
You'll need Surf to reach this level so skip this section and come back here, preferably after you obtain Fly.

Lapras Fridays
No one knows why only comes out on Friday, but it never misses one. It's resilient as well as punctual; if you accidentaly K.O. one, another will still return next week. Still, you probably don't want to wait (after al, Lapras is one of the best Pokémon in the game), so fight carefully and use Heavy Balls if you have them.

To catch one, use Surf to reach the southwest corner of this Cave. Then go down two floors. On this floor, near the end, you must Surf on the lake. Lapras should appear quickly, and will be around level 20, so if you have only strong Pokémon, it is recommended to take one weaker with a move like Sleep Powder or Hypnosis. You can also use // with Hypnosis and TM50(Nightmare) or instead of it you can use Night Shade if your Pokémon has low level.

Pokémon Found

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