There is one fatal flaw in the Lion Tower's strategy, and the Pride Quake's effectiveness.
Wobbuffet.
Because of this quirky dude, the Pokemon have a sure-fire way to defeat the lions, ESPECIALLY if they create a Lion Tower.
Here's how it will go down: the Lion Tower will be bombarded by the fastest Pokemon capable of flying. This includes, but is not limited to, Pidgeot, Dragonite, and Garchomp, all who are said to fly faster than sound.
Now, one way or another, that Lion Tower is GOING to fall when its slammed into by several birds and TWO dragons going at mach speeds. And when it does, it well fall, and the Quake Pride will be a result.
But Wobbuffet here will be waiting for it. Armed with a Focus Sash to survive the hit, it needs but do one thing: counter. The sheer force of the Pride Quake will ripple through its body, and be sent back at the remaining lions, two-fold. If, after this, the lions STILL insist on creating another tower, then, well, we can have some Pokemon use Heal Beam on Wobbuffet, or bring in a Wynaut for a repeat.
Face it, the Lion Tower can't beat this. You know it.