Flittle is a pure Psychic type, with a pretty cute design, but not as great a shiny. Flittle has pretty lackluster stats for the most part, with exception of alright base speed for a first stage. As well, has access to a good hidden ability with Speed Boost, but its regular abilities aren't as great for a playthrough. Then you have the movepool, which is okay, but gets walled easily by dark types, since basically the special moves it learns for most part are psychic type moves. Overall, Flittle is cute, but I just kind of see it as another potential forgettable pokemon of Paldea, as it gets outclassed heavily by its evolution.