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Here are some more examples:
Ariados:
Atk +50
Type: Bug/Poison -> Bug/Dark
?Ability: Adaptability
>Reasoning: Unique typing, makes up for low speed with stab sucker punch.
Armaldo:
Def +30, SpD +20
Ability: Regenerator
>Reasoning: Better bulk, patched up recovery, has decent typing and offensive stats already.
Butterfree:
SpA +20, Spe +30
Type: Bug/Flying -> Bug/Psychic
Ability: Adaptability
>Reasoning: Confusion might as well be its signature move, Adaptability counterpart to Beedrill.
Dewgong:
Atk +50
Ability: Technician
>Reasoning: Aqua Jet, Ice Shard, Icicle Spear get huge damage boosts. Also boosts Fake Out (and Frost Breath for what it's worth).
Furfrou:
Atk +10, Def +40
>Reasoning: Massive defense increase, that's about it.
Ledian:
Atk +20, Spe +30
Type: Bug/Flying -> Bug/Fighting
Ability: Pure Power
>Reasoning: Huge Power mon with good speed, everyone wants to see Ledian hit things properly.
Luxray:
Atk +15, SpD +10, Spe +25
Type: Electric -> Electric/Dark
Ability: Strong Jaw
>Reasoning: Everyone wishes Luxray was Dark type, has access to elemental fangs and Crunch, Thunder Fang is cooler than Wild Charge.
These are examples of ones that we've got written down. These are extremely rough ideas and erred on the side of making them too strong as opposed to too weak. It's easy to tone them down if they end up being too strong during gameplay.