From Pixelmon Wiki
Certain battle rules restrict the use of Pokémon with Sand Stream.
- Sand Stream Clause: Pokémon are not allowed to have the Sand Stream Ability.
- Weather Ability Clause: A team cannot have a weather-setting Ability and an Ability that boosts Speed when that weather is active. This includes the combinations of Drizzle and Swift Swim, Drought and Chlorophyll, and Sand Stream and Sand Rush.
|Pokémon||Type||Ability 1||Ability 2||Hidden Ability|
|Mega Tyranitar||Rock||Dark||Sand Stream||None||None|
|Hippopotas||Ground||Sand Stream||None||Sand Force|
|Hippowdon||Ground||Sand Stream||None||Sand Force|
|Gigalith||Rock||Sturdy||Sand Stream||Sand Force|