Chelsea meet Villa on the back of a 5-0 thrashing at Arsenal.
Pochettino said: "Of course, the end of the season is always the most difficult part. But yes, we need to believe we can compete better.
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"I think we were so soft against Arsenal. I think we need to repeat and feel the same feelings that we had when we competed against Manchester City or Everton, and try to apply that to our performance tomorrow.
"The players really know. They are disappointed and they feel bad. Tomorrow is a good opportunity to get the good feelings back again."
Pochettino added: "We are Chelsea. We need to feel that and sometimes show arrogance, in a good way, that we are Chelsea and we can perform."