Shadow Rider:
This one is likely the biggest problem for your TR team. Basically, anything that has Shadow Sneak or Sucker Punch can defeat it (STAB is suggested). Those Pokemon include:
- Cinderace
- Urshifu Single-Strike style
- Dragapult
- Bisharp
- Dugtrio(important since it can stop Shadow Rider from switching)
- Aegislash
- Mimikyu(important since it can take a hit and use Shadow Sneak again if Shadow Rider survives the initial hit, or it can use Swords Dance)
-Other Shadow Riders lol
Ice Rider
This one is much easier to dispose of, but still a threat nonetheless. These are some notable counters, cause Ice Rider has a looong list of counters
- Dragapult
- Chandelure(with Trick room and Imprison)
- BIsharp
- Cinderace
- Weavile
- Knock Off Rillaboom
- Metagross(kind of)
Foul Play users that are faster are also good at dealing with a boosted one. Klefki, Tyranitar, Umbreon, and Mandibuzz can get rid of a boosted Ice Rider Calyrex without much trouble.
Hope this helps :)