Take the example of Super Ubi Land. Nintendo would not accept it because the word Ubi also happens to be in the name of another company. Even though there was no relation. They made Notion games change it to Super Ubie Land and even after that they asked for another name change to change Ubie again to something else. They are that cautious.
Pokémon is even more of a hot button for them because Pokémon is a Nintendo property. They own it. If they won't allow someone to put a game on their system because the name is similar to another companies name, you have to assume there is no way they would ever allow a game that use their characters and their IP on their system. They are VERY aggressive on protecting their IP (Intellectual Property). As I said, one of my friends and former colleagues left Microsoft to be a laywer for Pokémon at Nintendo. They have a whole legal department with their own lawyers just for Pokémon.
None of this is meant to be rude, it is a discussion of the facts of how business works. There is no insult to you, no negative comments aimed at you. There is nothing wrong with making a Pokémon fan game, you just have to realize the Nintendo systems are the last place you are likely to ever see one get published since it is Nintendos property.