Question: In the 2001 Pixar Animation film, which Monster is the best friend to top scarer "James P. Sullivan", as voiced by Billy Crystal?

Context paragraphs:
Monsters University: Monsters University is a 2013 American 3D computer-animated comedy film produced by Pixar Animation Studios for Walt Disney Pictures.  It was directed by Dan Scanlon and produced by Kori Rae, with John Lasseter, Pete Docter, Andrew Stanton and Lee Unkrich as executive producers.  The music for the film was composed by Randy Newman, marking his seventh collaboration with Pixar.  It was the fourteenth feature film produced by Pixar, and is a prequel to 2001's "Monsters, Inc.", marking the first time Pixar has made a prequel film.  "Monsters University" tells the story of two monsters, Mike and Sulley, and their time studying at college, where they start off as rivals, but slowly become best friends.  John Goodman, Billy Crystal, Steve Buscemi, Bob Peterson, and John Ratzenberger reprise their roles as James P. Sullivan, Mike Wazowski, Randall Boggs, Roz, and the Abominable Snowman, respectively.  Bonnie Hunt, who played Ms. Flint in the first film, voices Mike's grade school teacher Ms. Karen Graves.

Toy Story: Toy Story is a 1995 American computer-animated buddy comedy adventure film produced by Pixar Animation Studios for Walt Disney Pictures.  The directorial debut of John Lasseter, "Toy Story" was the first feature-length computer-animated film and the first feature film produced by Pixar.  Taking place in a world where anthropomorphic toys pretend to be lifeless whenever humans are present, the film's plot focuses on the relationship between Woody, an old-fashioned pullstring cowboy doll (voiced by Tom Hanks), and Buzz Lightyear, an astronaut action figure (voiced by Tim Allen), as they evolve from rivals competing for the affections of Andy, their owner, to friends who work together to be reunited with Andy as his family prepares to move to a new home.  The screenplay was written by Joss Whedon, Andrew Stanton, Joel Cohen and Alec Sokolow, based on a story by Lasseter, Pete Docter, Stanton and Joe Ranft.  The film features music by Randy Newman, and was executive-produced by Steve Jobs and Edwin Catmull.

Billy Crystal: William Edward Crystal (born March 14, 1948) is an American actor, writer, producer, director, comedian and television host.  He gained prominence in the 1970s for playing Jodie Dallas on the ABC sitcom "Soap" and became a Hollywood film star during the late 1980s and 1990s, appearing in the critical and box office successes "When Harry Met Sally..." (1989), "City Slickers" (1991), and "Analyze This" (1999) and providing the voice of Mike Wazowski in the "Monsters, Inc." franchise.

If I Didn't Have You (Disney song): "If I Didn't Have You" is a song written by singer-songwriter Randy Newman, that appears during the end credits of the 2001 Disney·Pixar animated film, "Monsters, Inc." Sung by John Goodman and Billy Crystal (voices of James P. Sullivan and Mike Wazowski, respectively), the song won the 2001 Academy Award for Best Original Song.  This was Newman's first Oscar.  Previously, Newman had been nominated fifteen times in the Best Score and Best Song categories, but had never won.  Arguably "the film's lone song", the tune serves as the major motif for the film.

The Comedians (2015 TV series): The Comedians is an American comedy television series starring Billy Crystal and Josh Gad as fictional versions of themselves.  A 13-episode first season was ordered by FX, and premiered on April 9, 2015.  The series was developed by Larry Charles, Billy Crystal, Matt Nix, and Ben Wexler.  On July 23, 2015, the series was cancelled after one season.

America's Sweethearts: America's Sweethearts is a 2001 American romantic comedy film directed by Joe Roth and written by Billy Crystal and Peter Tolan.  It stars Julia Roberts, Billy Crystal, John Cusack and Catherine Zeta-Jones, with Hank Azaria, Stanley Tucci, Seth Green, Alan Arkin and Christopher Walken in smaller roles.

Pixar: Pixar ( ), also referred to as Pixar Animation Studios, is an American computer animation film studio based in Emeryville, California that is a subsidiary of The Walt Disney Company.  Pixar began in 1979 as the Graphics Group, part of the Lucasfilm computer division, before its spin-out as a corporation in 1986, with funding by Apple Inc. co-founder Steve Jobs, who became the majority shareholder.  Disney purchased Pixar in 2006 at a valuation of $7.4 billion, a transaction that resulted in Jobs becoming Disney's largest single shareholder at the time.  Pixar is best known for CGI-animated feature films created with RenderMan, Pixar's own implementation of the industry-standard RenderMan image-rendering application programming interface, used to generate high-quality images.

Monsters, Inc.: Monsters, Inc. is a 2001 American computer-animated comedy film produced by Pixar Animation Studios and distributed by Walt Disney Pictures.  Featuring the voices of John Goodman, Billy Crystal, Steve Buscemi, James Coburn, and Jennifer Tilly, the film was directed by Pete Docter in his directorial debut, and executive produced by John Lasseter and Andrew Stanton.  The film centers on two monsters employed at the titular energy-producing factory Monsters, Inc. — top scarer James P. "Sulley" Sullivan and his one-eyed partner and best friend Mike Wazowski.  In the film, employees at Monsters, Inc. generate their city's power by scaring children, but they themselves are afraid that the children are toxic to them, and when one child enters the factory, Sulley and Mike must return her home before it is too late.

Ferenc Mikulás: Ferenc Mikulás (17 August 1940, Dunapataj) is a figure in the Hungarian animation film culture.  He is the founder and director of the animation film studio Kecskemétfilm Kft., and the director of Kecskemét Animation Film Festival (KAFF).

Toy Story 2: Toy Story 2 is a 1999 American computer-animated comedy film produced by Pixar Animation Studios for Walt Disney Pictures.  Directed by John Lasseter and co-directed by Lee Unkrich and Ash Brannon, it is the sequel to 1995's "Toy Story".  In the film, Woody is stolen by a toy collector, prompting Buzz Lightyear and his friends to vow to rescue him, but Woody is then tempted by the idea of immortality in a museum.  Many of the original characters and voices from "Toy Story" return for this sequel, and several new characters—including Jessie (voiced by Joan Cusack), Barbie (voiced by Jodi Benson), Stinky Pete (voiced by Kelsey Grammer) and Mrs. Potato Head (voiced by Estelle Harris)—are introduced.

Supporting paragraphs: Billy Crystal Monsters, Inc.
Answer: Mike Wazowski.