Try ultra evolving some of the legendaries.like ultimadragon,He can be a big help to you.he is one of the best sweeper in the game.I finished this with my sleep team.so sleepers can be a big help in this.goodluck👍
You’ll find a section about stun burster / stun bombers. Acquire those that are freely available. For a start you then put only them and Gigarock in your lineup. Gigarock last. You’ll try to stun burst as much as possible 'til only Gigarock remains, HOWEVER, use Accelerate Team with one of the stun bursters so Last Bite on Gigarock is on 40s TU cooldown. And then try your best to win via last bite. It’s best if 3 monsters remain stunned for a long duration and you just take out the remaining one + it’s reinforcements as long as possible.
Maybe it isn’t quite doable because you run into issues at the beginning (against the enemy’s stun bomber and Banedragon entrance for example) or your Gigarock isn’t quite capable of handling it when the enemies monsters are no longer stunned for long. However, in that case, adjust your team composition. Agains the stun bomber and Banedragon for instance it might be useful to just start with 2 Protect/stun absorbers in the front. Hope those get killed off quickly and then commence your stun bursting.
In general the stun burst + Last Biter combo doesn’t care what comes before it. What’s important is that you can get that Last Biter initiation off properly. Meaning, you must be able to get Last Biter (in your case Gigarock) into the position where he’s the single remaining monster of your side. Also stun bursting won’t do you much good when there’s a stun absorber among the enemies current monsters at front (Knockback can help here tremendously!). Last Biters have to be also extremely careful about poisoners because it negates their hold-ground. Be always aware of that.
I’ve done all 3 difficulties of this SC with mostly Godfeather (also a Last Biter). The extreme one took a lot of setup and tries to get going but even that ended up being not particularly hard. If your Gigarock isn’t fully trained yet I highly recommend doing that, too. And then just keep going at it. Takes some time getting used to all the intricacies of Last Biter lineups but you’ll get the hang of it eventually.
Good and extensive advice @ToGo. In this case, i actually managed to do it without resorting to such extremes as you describe, but it’s great for players that don’t have such a strong lineup that the veterans are willing to help out. Thanks on behalf of all non-top players.