nothing happens
Nothing happens when you try to connect those two games.
Trade with another Pearl or Diamond.
The two in pearl are Cresselia and Mesprit.
No. The game you are asking about is actually two games! Yeah. Pokemon Diamond. And Pokemon Pearl. Why do you think they put a slash between the "diamond" and the "pearl"?
Two legendary Pokemon from Pokemon diamond, pearl and platinum.
yep
you cant "join" Pokemon, but you can make babies with two Pokemon
You can't catch it at Pokemon Pearl, you'll have to Transfer it from LeafGreen/FireRed or trade it with SoulSilver/HeartGold
You need two DS, one with pearl and one with Heart Gold, then you enter any Pokemon center and go to the union room lady and talk to her. Then talk to the trainer in the union room and select trade.
Weezing can be found in Route 227 and Stark Mountain on Pokemon Pearl. Weezing isn't rare in the two locations it appears in.
you cant catch entei on Pokemon pearl. entei is a johto Pokemon and Pokemon pearl is a sinnoh game. the only way to getentei is to trade it over from another game games compatible are Pokemon diamond, Pokemon platinum, Pokemon soulsilver and Pokemon heartgold. the last two i am sure you can get entei. (i have seen it in the wild)
in the lab on the way out there our these two people