Hello... :(
Sorry for being a noob
But i want to know how i can put day-night tinting in the battle screen, because i want to put it in my game...
please :)
(Sorry for my noob english)
You can either go with the easier method that requires more pictures (i.e. the project takes up more space), or the harder method that uses shading. Let's assume the easier method.
I'm not going to explain this in detail, because frankly, I don't know. This is nothing more than my intuitive guesswork. As far as I know, this would work (although it still requires a half-decent grasp of scripting, and a whole lot of backdrops/grounds).
Find the part of the script (PokeBattle_somethingorother) where the backdrop and ground pictures (the two circles on the ground) are loaded. Expand on those lines to turn them into IF statements depending on the time of day ($time.now.hour or whatever it is - look it up). Set it such that if the time is between x and y o'clock, use picture "bggrassX.png", where you have a bunch of pictures where X is a number, all of the same background but with different tints to them (i.e. darker at night). Remember to cover all the time in the day, so that a picture will always be loaded.
You could have day/night picture, or morning/day/evening/night pictures, or even one picture per hour. It's up to you to decide how many different pictures you want to make and use.
Note that this won't affect the pokémon sprites - they'll always be the same brightness. Unless you try to be clever and create tinting for them as well (in which case make sure the other parts of the game that display pokémon sprites, such as the Pokédex, aren't messed up by what you do here).
I suspect you'll need to change several parts of the scripts the same way, so make sure you find them all.