Using a shock pulse focused loadout, Grohk can frequently slow down and damage groups and even hurt fragile champions behind cover. Use hard shields (Barik, Fernando, Makoa) frequently to protect your team.
If Evie uses her Ice Block to heal herself or to avoid damage, you can scatter Sticky Bombs around the Ice Block so you can hopefully kill her. Good reaction time is the key!
Body block her in close quarters like tunnels and houses she cant teleport as far then and even if she ice blocks after your hook, you should be able to still keep her from escaping if youre in compact space.