One of the elements that's returned for Pokemon Mystery Dungeon Rescue Team DX is the ability to link moves together, allowing you to perform multiple attacks at once. We'll show you how to link moves and what the benefits and costs are.
How to Link and De-Link Moves
If you want to link moves together, you can do that in the Pokemon Square hubtown, specifically by going to the Gulpin Link shop in the lower-right corner, just next to the path that leads to Makuhita's Dojo. Gulpin will offer to link any of your team's moves together for free, as often as you want. He'll also let your Pokemon remember any forgotten moves, and de-link moves he's linked previously. He's pretty helpful like that. Just speak to him, select the option to link moves, choose the team member and whatever attacks you want linked. He'll do so immediately, allowing you to take your new set-up into the field.
How Do Linked Moves Work?
Linked moves basically allow you to use both of them at the same time, all in a single turn. Link together Grass Knot and Thundershock, and your Pokemon will use them both in the time it takes anybody else to do one single attack. Keep linking them up, and you can use all four moves in a single devastating sweep
There is an immediate cost to this, however: hunger. Using linked moves empties your belly by 1 for every move you take, meaning that four moves at once empties your belly by a notable 4%. You also can't not use linked moves once they are connected, so until you complete the dungeon and de-link them, you'll be stuck using linked moves and burning up energy dangerously fast.
What Moves Should I Link?
Linked moves basically function as combo moves, so you'll want to choose attacks that compliment each other. Don't mix long and short range attacks, don't put enemies to sleep before you hit them, don't link two separate moves that both do status effects. It can always be smart to put a defense-lowering attack before a hard-hitting move, and generally speaking you shouldn't link all four moves unless they all have a lot of P.P. and you've brought extra food, because there's rarely any need for that kind of firepower.
Hopefully that explained everything you need to know about linking moves. You can head here to see the details on evolution in Mystery Dungeon, or go here to see everything that's changed since the original game.