Well you would need a lot of mathmatics knowledge, and knowledge of the Pokemon game machanics, for example:
{
other.HP = (other.HP - (self.power * ((self.attack / 2) /other.defence)));
}
that's a very simple version of it but you'll need it a lot more complex version then that and you will want the exact formulas, you can find a lot of them on serebii.net .
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There are various ways that you cold try to make a game like Pokemon. For example, you could try using RPG maker.
1. go to Pokecommunity.com 2. Go to "Game Development" 3. Find "Pokemon Essentials" This is a starter kit to make Pokemon games in RPG Maker XP
sorry but you can't or i can't it's up to the "MAKER'S" choice to make a new Pokemon game with a nude code.
The best and only DS Game Maker in development is called 'DS Game Maker'. You can download it from http://www.dsgamemaker.comIn reference to the previous answer (which I have included below), I believe the asker was looking for a product, not an organisation, or else he/she would have put: 'WHO is the best DS Game Maker?'.Previous Answer: Nintendo, they make all the Pokemon games, with help from game freak, and they also make Mario
Download something called "Pokemon starter Kit" It comes with everything you need for a Pokemon game.