If a flying type uses roost while toxic spikes or spikes are around them, will they get hurt by it?

Question

Say I have a Nidoking use toxic spikes on my opponent. They switch to the Dragon/Flying type dragonite. Thanks to his flying type, he will not be poisoned from the Toxic spikes. If he uses the move roost, will that ground him and cause him to get poisoned? I know that they are entry hazards, but I know you can work around them and still get hurt from them in certain instances. is this one of them?

Answer 1

No, a Flying type Pokemon cannot be Poisoned if it uses Roost while a layer of Toxic Spikes is set up. There is another way around this though. Lets say your Nidoking set up Toxic Spikes on your opponent, and here your send out a Dusknoir after you set up and use Gravity, then if a Flying type Pokemon enters, they will get inflicted with Poison.

This goes for Toxic Spikes+Crobat as well. I mean that if a Poison type enters while Toxic Spikes are up, they go away. If Crobat uses Roost with Toxic Spikes are up, the Entry Hazard will not go away, but you can use the Gravity Trick with Crobat to get rid of them.

Answer 2

Nope, Dragonite is safe from Spikes, and T-spikes, the only entry hazard that will hurt him is Stealth Rocks, doing 1/4 damage from effectiveness.
I think you hit the nail on the head when you said that they are entry hazards, so no damage from Roost.