>>21705577The beginning of a story is always the hardest part. It's your baited hook after all. If you don't get it just right, you'll miss your fish, or rather, your readership. It's also the part of your story that will make the biggest impression on your audience, as it is the first thing they'll see when you flip open the book. (Barring the cover, but no one uses covers on the internet.)
It does get easier once you get your setting and character established, but the difficulty returns once you realize that you need to keep your characters in line with themselves otherwise you'll run into some glaring plotholes and personality conflicts. I agree that keeping memos is a good idea to keep all the facts straight if you're writing about a million protagonists.
I can't answer the language question.
There is nothing wrong about writing about Pokemon you personally like. It's your story after all. If you want to just write endless stories about Gardevoir, go right ahead. However, whether or not your audience will be interested in reading swathes of pages about Gardevoir is another issue. That being said, don't let other people influence your work. If your magnum opus is going to be about your favorite Pokemon, don't be discouraged because someone came up and screamed at you for using "overused/popular/furfag" Pokemon. Write what you want.
It takes practice to do descriptive writing. All I can say is to read more books and do some simple mental exercises. An easy way to do this is to bring a notepad with you as you go out on a walk. Take a look at your surroundings, and jot down every last detail you can eke out of what you see. 'That tree has rough, dirt - brown bark with leaves as sharp as hedgehog quills.' or 'There's an adorable puppy running around. It has fluffy white fur that makes it look like a snowball!'
Don't worry about how stupid your sentences may sound. Just write what you see, and get in the mindset of describing things using words.