ruleslawyer said:
Well sure it doesn't solve
everything. You'd need to give it wings too.
What for?
I think allowing the Tarrasque to follow the PCs everywhere is missing the point. By the time the PCs reach a level where they are a threat to the Tarrasque, they will be able to get away if they choose to anyway.
The trick to staging a fight against the Tarrasque is to make sure that there will be horrible consequences to
not confronting it. The death of a PC doesn't count as "horrible consequence" - not at this level, since they can get ressurected in short order. The Tarrasque must threaten something that the PCs deeply care about - a village, city, or other major structure with lots of inhabitants should do nicely. Sure, they
can run away at any time - but either their image as heroes or their pride will suffer for it, and possibly lots of innocent people as well.
The Tarrasque is not a cunning and sapient dragon. Once they get out of its sight, it is unlikely to try to chase them down - it is too dumb for that, and all those small figures look basically the same. It will soon revert to its normal behavior - eating anything it
can see. Even diverting its course for some time should count as a minor victory.