which team was against it for the latter one?
The Atlanta Falcons.
Denver Broncos
he Broncos repeated as Super Bowl champions the following season, defeating the Atlanta Falcons (led by Elway's longtime head coach Dan Reeves) in Super Bowl XXXIII, 
what is thunder (mascot)? A horse that is also an official live animal mascot. what is its duties as the last? The duties include leading the team onto the field at the start of every home game, and a gallop down the length of the field whenever the team scores a touchdown or field goal. which team are you talking about? The Denver Broncos Football Team. does it appear for any other match or team? It appears only for every match of the said team . who is the founder of this team? Bob Howsam. when? 14 August, 1959. who is its coach? The current head coach is Vic Fangio. what did it do during the span of 1997 to 98? They won Super Bowl XXXII and Super Bowl XXXIII.
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Denver Broncos [SEP] 1997–1998: Back-to-Back Super Bowl Champions
During the 1997 season, Elway and Davis helped guide the Broncos to their first Super Bowl victory, a 31–24 win over the defending champion Green Bay Packers in Super Bowl XXXII. Though Elway completed only 13 of 22 passes, throwing one interception and no touchdowns (he did, however, have a rushing touchdown), Davis rushed for 157 yards and a Super Bowl–record three touchdowns to earn the Super Bowl Most Valuable Player Award—this while overcoming a severe migraine headache that caused him blurred vision. The Broncos repeated as Super Bowl champions the following season, defeating the Atlanta Falcons (led by Elway's longtime head coach Dan Reeves) in Super Bowl XXXIII, 34–19.