Densharr
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If you go RAW, a Helm of Opposite Alignment may be pretty fun to try - rather, 20 helms created by someone other than a minimum CL crafter, and weilded by 20 hired-hands that the party teleports atop the Tarrasque's head to attempt placing them on one of its many knobbly protrusions. Statistically, one should succeed against the Tarrasque's low will save. It's technically a Transmutation effect, not mind-affecting, and doesn't have the [Polymorph] tag.
As written, the Tarrasque is True Neutral, so it would be shifted to one of the four extremes: LG, CG, LE, or CE. 50% chance that the Tarrasque becomes good and is neutralized as a threat, and a 50% chance that it becomes evil and subject to the Paladin's smiting (also, 100% chance it becomes either lawful or chaotic, allowing other party members with alignment-specific shenanigans to have some fun).
Should the GM be willing to say that as a Spawn of Rovagug, the Tarrasque is CE instead... The HoOA will shift it to LG, and the Paladin gets the best mount in Golarion.
