This might not be too difficult. Each cell could have a class 'level40' or 'level40plus' or whatever indicating the level. Click the toggle and it'll hide all non 'level40' cells.
Actually, this would be a pain, wouldn't it? Everything is set in a table, so you can't simply hide cells. You'd have to completely redraw the table. Also, every cell has a number included indicating its position on the list. That would need to be updated.
Maybe make a new page? Although, that'll increase the render time of the website.
Add a toggle to "show only level 40 pokemon"
This might not be too difficult. Each cell could have a class 'level40' or 'level40plus' or whatever indicating the level. Click the toggle and it'll hide all non 'level40' cells.
Actually, this would be a pain, wouldn't it? Everything is set in a table, so you can't simply hide cells. You'd have to completely redraw the table. Also, every cell has a number included indicating its position on the list. That would need to be updated.
Maybe make a new page? Although, that'll increase the render time of the website.