>>11761934In the Japanese version, Gender wasn't in the actual gameplay anyway. It's like Rescue Team where it just worked regardless of gender for Moves like Attract. The option was solely for dialogue purposes.
The only thing this removal really does is one show that Nintendo are being lazy with localization like FE:A, where each voice option had their own script in the Japanese version but the English one had no changes in script and two less options, and two forcing the homolust in the script.
>>11761956From what I've heard, abilities like Rivalry work off of types. Don't know if there's anything actually behind that though.