Pokemon Umbral Discussion 25: Pokegeddon Returns

[Menarker]

Engineer's work differently I think. It's an aura, and not so much a "stick and apply enchantment". If Mollesk tried to use Power Trick while being in a Defense boost like Mirror's, the boost to attack (leaving only his base defense as his attack) would disappear because it never actually stayed "stuck" to Mollesk as a defense boost. Mollesk will continue to have a defense boost due to the aura, but using the base attack stat that was swapped instead.
Otherwise, I would send Mollesk out, have a +4 boost to Defence due to his Simple Nature, Power Trick so that boost applies to his attack, while his new defence got boosted by 4 too. (I doubt you'd approve of that)

With buff items, first there is a limited supply of items. Too many of them and you don't have revive or restore items to recover from the damage that one takes. Also, items by far only have 1 stage boosts. We don't even have 2 stage boost items (and the foes have 3 stage versions combined with Full Restore as a comparision) We'd need Dormond to get 2 stage boosts, and even then, that's pretty low power considering it takes up item slots. If someone intends to use a plan that rely on those items, he/she should be rewarded for using them, considering the risk of running low on healing items.
As for mentioning Lola's tech, Psych Up doesn't consider how many people have the buff. It only cares about the buffs on the one single person and how high it is. Spreading it around does no better than applying it on one person. Psych Up/Baton Pass works when the buffs are focused hard on a single target.