Dragon vs. Wizard

[Beleriphon]

Since it is obvious how a lvl 20 wizard could beat a CR 20 dragon from the "Wizard vs. Dragon" thread, how could you make/play a dragon in order to beat a wizard.

The Rules:
1) Base creature must be one of the "true dragons"
2) Creature gets equipment equal to that of an NPC of 20th level (220,000 gp)
3) You may use any class or template, but you must reference the splat book it's from if its noncore
4) No cheese

1) Great Wrym Red Dragon + 20 levels of Druid.
2) Wild Shape into something fun
3)No none core
4)20th level druids are only cheesy in so far as druids are cheesy in general.
5) Dragon wins.

There we go. I should also point out that you never said the dragon had to be CR20 in return. My result has a CR46 monster fighting a CR20 wizard.