Note that Rare Candies will still work to rise above the cap, but any Pokemon above the cap will no longer obey you (like traded Pokemon in the official games, but applies to all Pokemon in Rejuvenation).
You can take advantage of this to get a level-up move or evolved Pokemon before the level cap rises to the needed level, as you can use Reverse Candies to de-level your Pokemon back below the level cap, and then your Pokemon will obey you while keeping the move/evolution obtained at the higher level. I did this to evolve my starter for the very difficult ghost gym battle, where the level