Federer, 35, despatched Russian Karen Khachanov 6-4, 7-6 (7/5) on Saturday to move into the final.
Roger Federer reflected on a "difficult year" after beating Alexander Zverev to win a ninth Halle title as he provided the ideal platform to build upon for Wimbledon. Make sure I serve well, because he can go through spells where he can serve big.
Zverev booked his second successive final spot when he beat Frenchman Gasquet 4-6 6-4 6-3. Federer though is undoubtedly the greatest grass player of all time, and is in the best form he has been in for quite a while.
Federer grabbed the crucial break in the opening set to take command of the match and did not allow Khachanov back in. Of course I could have played better but he didn't really let me play my best tennis.
The former world number one is looking for some grass court matches under his belt ahead of Wimbledon
"It was all a little uncertain because I don't know him that well", said Federer. Federer has yet to drop a set this tournament and showed he's capable of winning a match easily despite winning just 39 percent of his return points.
Federer made a strong statement before the Championships at the All England Club, which begin on 3 July, with an imperious display against the world number 12.
Federer defeated Zverev's older brother Mischa in the second round this week.
Italian Open champion Zverev had won all three of his previous finals this season, but was blown away by a vintage performance from the 18-time major champion in only 53 minutes.
Another success at Wimbledon will put Federer clear of Pete Sampras' joint-record seven men's singles victories at SW19.