vs. Morimoto & Nishino
Before beating the game, you could challenge two of the GAME FREAK staff — Morimoto and Nishino — to a battle each day. They didn't use overly strong Pokemon, but provided a fair challenge during your first visit to Castelia City. However, after beating the game, they become much stronger.
Inside of the GAME FREAK building, which can be found on the eastern-most street in Castelia City, take the elevator up to the 22nd Floor, where you can find Morimoto and Nishino waiting on a table. Although they use high level Pokemon, they are not extremely strong and you can take them on with Pokemon in their low to mid 60's.
||Game Freak Morimoto||$6240|
||Game Freak Nishino||$6240|
Each of them can be battled once per day, making it a nice way to gain EXP.