Nimbly, oh how you were robbed. If you'd had Super Luck I would say slap a Scope Lens on her and watch the Night Slash crits never end. But as for a mixed attacker with kinda crappy speed, I think you have two valid choices.
Night Slash|Air Cutter|Superpower|Heat Wave+Scope Lens Dark Pulse|Aerial Ace|Sucker Punch|Substitute+Choice Scarf
For Atreyu the only suggestions I can really make are maybe sacrificing Earthquake for Protect just in case? I dunno that seems like one of those things I'd do and then forget to use. Other than that just find this boy a Black Belt and let him conquer evil dammit.
As for Kracko, you could do something cheeky like a Rain Dance+Thunder build here depending on how utilitarian you want your Ampharos to really be. That aside, Charge Beam really just doesn't hold up to Thunderbolt or Discharge by comparison, the single level SpAtk boost just isn't worth the much lower power to me. I'd say pick between Thunderbolt and Charge Beam and just go with Focus BlastSignal Beam and Thunder Wave/Substitute depending on whether you need paralysis, or just ditch the utility and stick with both electric attacks. Choice Scarf might be the best thing for Ampharos all around out of the options you've got.
no subject
Night Slash|Air Cutter|Superpower|Heat Wave+Scope Lens
Dark Pulse|Aerial Ace|Sucker Punch|Substitute+Choice Scarf
For Atreyu the only suggestions I can really make are maybe sacrificing Earthquake for Protect just in case? I dunno that seems like one of those things I'd do and then forget to use. Other than that just find this boy a Black Belt and let him conquer evil dammit.
As for Kracko, you could do something cheeky like a Rain Dance+Thunder build here depending on how utilitarian you want your Ampharos to really be. That aside, Charge Beam really just doesn't hold up to Thunderbolt or Discharge by comparison, the single level SpAtk boost just isn't worth the much lower power to me. I'd say pick between Thunderbolt and Charge Beam and just go with Focus Blast Signal Beam and Thunder Wave/Substitute depending on whether you need paralysis, or just ditch the utility and stick with both electric attacks. Choice Scarf might be the best thing for Ampharos all around out of the options you've got.