The pokehack of today is Pokemon Cloud White 3, here is a description from pokeharbor:
"The Cloud White ROM hack series is one of the more interesting hacks available. That's where Pokemon Cloud White 3, the third game in the series, comes into play. The plot picks up shortly after Cloud White 2 concludes. This is a good thing if you're a die-hard fan of the series or have already played the first two games.
Cloud White 3 has a lot of intriguing features that will keep you interested. You have several Regions to explore as well as a plethora of Pokemon to capture. It also includes some open-world elements that you may enjoy in certain areas of the game. Here are some of the features that may pique your interest in Cloud White 3.
Features
4 regions(Sinnoh, Sevii, Seto, Kouros)
Secret areas
Open World (Seto, Sinnoh and Kouros)
More than 60 hours of Scenario
Gen I to Gen VII Pokémon. All catchable.
Mega evolution
Pokémon Universe characters (Ash Ketchum, Misty, Giovanni, Elm, etc.)
Physical Special split
Expanded cash limit
Expanded bag limit
New items and evolutionay methods
Increased difficulty
Honey tree system
Berry tree system
Fairy type
The Pokémon World Tournament
Player is facing your opponent before battle
Day and Night System
Run everywhere!
Unlimited TM
A bonus Premier Ball is offered for every purchased of 10 Pokéballs
Experience points are gained after capture
Automatic re-use of repel
All weathers available
Maximum level up to 200
And several more features …
New graphic style from DPP, HGSS, Glazed and more
New battle backgrounds
New battle boxes
New text boxes in HGSS Style
New Bags with expanded storage limit
New Pokémon menu
New Trainer Card and Badges
New bootscreen and Titlescreen
New trainer sprites
New songs from FF, Zelda, Pokémon Emerald, etc.
Cry edited for all Gen in High Quality"