idk if this is the right place to say but for RBY Tradebacks OU, there is a legality issue.
Exeggutor should be able to learn Sleep Powder and Stomp on the same set. Theoretically it should be illegal cause Exeggcute learns Sleep Powder at lvl 48 while Exeggutor learns Stomp at lvl 28. However, Stadium 2 has a move relearner, so you could level Exeggcute up to lvl 48 to learn Sleep Powder, evolve it, trade it to Stadium 2, use the the move relearner to relearn Stomp, then trade it back to RBY.
This issue only exists for Tradebacks OU, without trading to gen 2, you can't access the move relearner and thus, it's illegal w/o tradebacks