If by that you mean how to use it? what you do, or what i do is...
lets say for example were playing Pokemon silver, we want charizard but the game doesnt have any wild charizards... so i go on Pokemon blue and get a charizard.
after you have the charizard on blue go to the nearest poke with time capsule then save and switch games.
In Pokemon silver find a wild Pokemon that is "fresh" meaning it hasn't got any TMs or HMs added, also it needs to be a Pokemon you can find in Pokemon blue. so lets use ratata for example, now do the same on Pokemon silver and go to a time capsule.
for this next part you will need two game boys and a link cable...
Set up the link cable and turn on both GBs then talk to the lady and follow all her directions to trade the charizard for the ratata.
Hope this info helped
-Brandon
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Time capsule will be available to use, when you first time visit Ecurteak(spelling?) City.
use the time capsule upstairs in the Pokemon center
The lock capsule is currently useless (and unable to open), but is speculated to be of some use in Pokemon Black and White.
In Pokemon Red, Blue, Fire Red, or Leaf Green, Bulbasaur is a starter Pokemon. In Pokemon Yellow, a girl will give you one if Pikachu's happiness is high enough. In Heart Gold and Soul Silver, a Bulbasaur is a reward for defeating Red. In any other games, you must use the Time Capsule, Pal Park, a trade, the Dream World, or PokeTransfer.
teach a Pokemon headbutt and use it on small trees teach a Pokemon headbutt and use it on small trees