In the third and fourth generations, which pokemon require events?

The event-only Pokemon for 3rd Gen are:

• Mew
• Lugia
• Ho-oh
• Celebi
• Deoxys

Jirachi can be acquired with the Pokemon Colosseum bonus disk (that's where mine is from ♪).

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The event-only Pokemon for 4th Gen are:

• Celebi
• Deoxys
• Darkrai
• Shaymin
• Arceus.

Mew can be acquired with Pokemon Ranch, while Lugia and Ho-oh are caught in Heart Gold/Soul Silver.