Sure, I can help you create a simple Game Boy-style game with Pokemon-styled gameplay using HTML and JavaScript. Below is an example implementation that you can use as a starting point. This is a simplified version that showcases the basic mechanics and can be expanded upon to create a fully fledged game.
In this example, we have a game screen represented by a `<div>` element, and the player character is displayed using a pictogram (☺️). The player moves using the arrow keys on their smartphone.
Note that this is a simplified version, and to fully implement a game with Pokemon-styled gameplay, you would need to add additional features such as battles, maps, capturing mechanics, and more.