You can't catch Murkrow in Pearl. Murkrow is a Diamond-only Pokemon. Just like Misdreavus is a Pearl-only Pokemon.
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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)
The best way is to catch Gligar on Route 206 in Platinum then trade back to Pearl. Did that help? (Oh, and Gligar can be found on Route 206 in Pearl, but are rarer and recquire a certain method using the National Dex, not sure what...)
Normally you can catch it in pearl after beating the elite 4 but in diamond the only way is to trade with someone who has a sealeo on their pearl, or migrate it from emerald.
you can find feebas on the way to catch garitina diaogia and palkia you need to use a good rod to catch him
the only way you can get regice in heart gold is by trading from Pokemon platinum,diamond and pearl