Use OnTopReplica program, it lets you create a window that mirrors another selected window, then you can make that window as large as you like. Just make sure your focus is still on the actual game or you wont be able to move around n stuff :)
Here is how big my screen is
Many Sprites are glitched like my Shiny Dimeles https://gyazo.com/1bfd50d12256c715a97ca04a498191d2 and also clicking on a pokeball containing Paralyze Heal inside the Auklet Lighthouse crashes the game!
Use OnTopReplica program, it lets you create a window that mirrors another selected window, then you can make that window as large as you like. Just make sure your focus is still on the actual game or you wont be able to move around n stuff :) Here is how big my screen is https://gyazo.com/b6478c287b714c176a8f5b50b2c46d00
For now use the program On Top Replica. You right click the window it creates, select Select Window > then click the game. Then you can expand this window as large as you like. Here is an example
https://gyazo.com/b6478c287b714c176a8f5b50b2c46d00
Thats how large the screen is that I'm playing on :) Just remember to keep the actual game window as your focus, and not the on top replica window