The visitors lost the day-night first Test at the Gabba by 39 runs, having made a bold bid at a come-from-behind victory.
Former Zimbabwe star Flower believes the Melbourne conditions will give his side a better chance of taking early wickets and exposing Australia's middle-order with reverse swing.
"(The pitch) looks good. It looks hard. It's going to have good carry," he said this week. "It's going to be hard work for the bowlers, but if we can get into them early and if the ball starts reversing then I'm sure we've got a good chance of making some things happen."
"Hopefully towards the end of the match, Yasir can come into it a bit more," Flower said. "I'm sure if the ball is turning a bit more, there will be more attacking lines bowled."
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Australian batsman Usman Khawaja doubts that Pakistan has the momentum after its fourth-inning performance in Brisbane, nearly chasing down 490 runs.
"I don't think that matters -- it's a different ground, different conditions, and you can't really measure momentum, can you? I'm not sure if it exists," Khawaja said. "There are always things we can do better, no matter what game, but ... we still won."
Chief police commissioner Graham Ashton said while they are confident the terror plot had been contained, extra police will be deployed at major events.
"We know there's lot of events on over the next several days right across our state, including the Boxing Day Test, Christmas carols, other events that are on," he said.
"Our security team is in contact with the relevant authorities to ensure we have the appropriate level of security at the Boxing Day test and other cricket matches being held around the country," Cricket Australia chief executive James Sutherland said in a statement.
In a security-related move late in 2015, the MCG erected a new perimeter fence about 20 to 25 meters (65 to 80 feet) away from the stadium where spectators queue to pass through security before entering the ground.