How do I get rid of these "pokemon app" popup ads without hard resetting my phone?

I downloaded a pokemon app that I removed immediately after but I believe it gave me a virus. I have ads pop up everywhere even when I have no apps open. I have the samsung galaxy S7. I don't see anything in settings that could help me so if there is an app I could rely on or if I am overlooking the settings then let me know, please.

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