Yes you can link battle between Pokémon Blue and Pokémon Crystal however you can't use Johto-introduced Pokémon or Johto-introduced attacks though.
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It is not available in Pokemon Crystal. You will need to trade for it from Pokemon Red, Blue, or Yellow.
trade it from red,blue, or yellowMewtwo is not catchable in the wild in Pokemon Crystal.
You cannot catch Mewtwo in Pokemon Crystal, but you can trade it from a Pokemon Red or Blue. Hope this helped :)
These games can fight with each other: Pokemon stadium 1 and 2 with red, blue, yellow, gold, silver and crystal. Red, blue and yellow can battle each other and gold, silver and crystal. Ruby, sapphire and emerald can battle with each other and firered, leafgreen, Pokemon colosseum and Pokemon xd gale of darkness. Diamond, Pearl and Platinum can battle each other and Heartgold and Soulsilver. The games that can battle each other can also trade with each other as well.
Squirtle is not available in Pokemon Crystal. Squirtle can only be found in Pokemon Red, Blue, or Yellow. Squirtle can be traded to Crystal from those titles.