Fix

commands/pokedex/pokedex-box-sprite.js

@@ -90,7 +90,7 @@ module.exports = class PokedexBoxSpriteCommand extends Command {
 			const height = 30 * ratio;
 			ctx.drawImage(this.client.pokemon.sprites, x, y, 40, 30, 0, 0, 250, height);
 			cropToContent(ctx, canvas, canvas.width, canvas.height);
-			attachment = canvas.toBuffer();
+			attachment = canvas.toBuffer('image/png');
 		}
 		return msg.say(`#${pokemon.displayID} - ${pokemon.name}`, { files: [{ attachment, name: 'box.png' }] });
 	}