1 move that interacts with a the user's ability:
Move Name: Adaptive Strike
Category: Physical
Type: Normal
Base Power: 75
Max PP: 16
Accuracy: 100%
Effect(s): If this move's type has been changed by an ability (i.e. Refrigerate, Galvanize, Aerilate, etc.) then its base power is doubled.
Reasoning: I was looking at abilities and took note of the type-changing abilities, which have always been some of my favorites, so I think it would be interesting if a Pokemon with one of these abilities had a move which became much more powerful with it becoming changed, to be honest I don't have much other reason besides it possibly being fun and overall stupidly powerful.
Edit: Abilities in question are the type changing abilities such as Refrigerate, Galvanize, Aerilate, Pixilate, and I think those are about it- of course exceptions would be Liquid Voice since this isn't a Sound-based move, and then Normalize because this is already a Normal-type move and thus I don't think its properties would get triggered since the type of this move wouldn't be changed.
1 ability that interacts with a particular move or move category:
Ability Name: Expressive
Description: This Pokemon's Normal-type moves change their type based on the nature of this Pokemon (Fire-type if +Atk, Steel-type if +Def, Water-type if +SpA, Grass-type if +SpD, Psychic-type if +Spe, Remains Normal-type if no changes); these affected moves' power is x1.2, unless they remain Normal-type in which these moves' power is x1.5.
Reasoning: I was thinking about the move I was creating and thought it would be interesting to make this ability as a possible option, thought I don't think that would actually happen, I liked the idea of this, working as an odd Hidden Power in the form of an ability, of course it would simply be a signature ability, and again, I think this could be fun and work really interestingly with anyone, it's an odd ability, and a very unique one at that.
Edit: Cause I forgot to say, the moves in question would be Normal-type moves of course, if that counts.
1 signature item:
Item Name: Blazing Loyalty (In A Bottle)
Description: If held by Arcanine then if its ability is Intimidate then it drops the opposing Pokemon's attack by 2 upon switch-in, if its ability is Flash Fire then when hit with a Fire-type move its Fire-type attacks do 2x damage, and if its ability is Justified then its attack is raised by 2. If Arcanine is to lose this item then its speed is raised by 2.
Reasoning: Arcanine needs a boost, that and I like Arcanine as a dog-lover, besides I typically see signature items as items to give boosts to these specific Pokemon of course, so again, I see this as an opportunity to really make more Arcanine viable and possibly more fun to use.
Edit 2: In hindsight I'm realizing I probably wasn't supposed to assign it to a Pokemon, so lets just say whatever Pokemon does get this (preferably a Fire-type given the name, though of course no-one has to listen to this bit) its abilities affects would be doubled, and of course when it loses this item its speed would be raised by 2.
Edit 3 (albeit unnecessary): Hope this all make sense and are okay and work fine, may have gotten a bit confused with the kinds of things I was supposed to create, as such I apologize haha.
Edit 4: Changed the name of the ability to something I felt to be more fitting, hope that is fine/allowed.
Edit 5: Grammar