No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
The search function of this forum will be your best friend for this question, as it has been answered many times.
Long story short. You must dispute directly with the company that made the inquiry. The CRA will not remove them.
As far as permissible purpose...this information is obtainable but there is a lengthy process. Again, it has been answered before here.