"You don't want to be a distraction," Pacheco said. "You just want to blend in. I did the best I could."
In addition to third base, second base and catcher, Pacheco can play the outfield -- versatility that helps him stand out -- though the team hasn't specified if he'll be slotted into a more specific role. For now he's ready to help at any position.
"When I get a bunch of reps at a certain position, obviously I get more comfortable in that atmosphere and that setting," he said. "The last few years, it's kind of been just going out there, whatever position I'm at, [to] just compete.
"I'm definitely happy to be here," he said. "I've played against a bunch of these guys, and I'm glad I don't have to face some of these pitchers anymore."
Evans had just one hit in 11 plate appearances for the D-backs this season, including an 0-for-3 performance against the Astros on Wednesday night as the designated hitter.
In 72 at-bats for the Rockies this season, Pacheco hit .236, with eight RBIs and six doubles.
Although he has struggled at the plate in 2014, he's a career .281 hitter, including .309 in 2012.
"He's a really good hitter," manager Kirk Gibson said. "He's a good fit for us right now."
Mike Vernon is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.