Fix off-by-one champions; implement Strong Jaw

This fix currently has the unintended side effect of making Champion Leon unable to be fought, but every other set of Elite Fours is now followed by the proper Champions as intended.

src/data/biomes.ts

@@ -7610,10 +7610,10 @@ export const biomeTrainerPools: BiomeTrainerPools = {
     [ TrainerType.IRIS, [] ],
     [ TrainerType.DIANTHA, [] ],
     [ TrainerType.HAU, [] ],
-    [ TrainerType.LEON, [] ],
     [ TrainerType.GEETA, [] ],
     [ TrainerType.NEMONA, [] ],
     [ TrainerType.KIERAN, [] ],
+    [ TrainerType.LEON, [] ],
     [ TrainerType.RIVAL, [] ]
   ];