I'm not an expert on flyweights (or anything else for that matter), but during his day Pascual (Pascal??) Perez was thought to be the heaviest puncher ever in the flyweight division, so I throw his hat into the ring for this thread's consideration. He scored 57 stoppages in 84 fights, held the title for four years, and had six successful defenses. He lost the title when he on the far side of 33-years old. Like Wilde, he was an undersized flyweight, 4 teet 11 inches tall and weighing on average 106-109 pounds.
By all accounts, Pascual Perez was generally recognized as the WORLD FLYWEIGHT CHAMPION from 1956 to 1960. You raise a valid point about the location of his fights before he fought for the title, but your statement does not bear up during the time period while he held the title, namely that He won the title from Yoshi Shirai, a Japanese, in Tokyo, Japan He successfully defended the title against Ramon Arias, a Venezuelan, in Caracas, Venezuela He successfully defended the title against Dommy Ursua, a Filipino, in Cordoba, Manila Phillipines He successfully defended the title against Sadao Yaoita, a Japanese, in Osaka, Japan He lost the title to Pone Kingpetch, a Thai, in Bangkok, Thailand Your selections are certainly good ones.
I'd also mention Antonio Avelar. Huge puncher, but the definition of glass cannon and bully. Very physical for the weight.
Jimmy Wilde has to be #1. He was basically a strawweight KO'ing bantamweights and even featherweights. Donaire is up there too.
Avelar KO of the very talented Tae Shik Kim came to mind when I saw your post. This content is protected
Michael Carbajal could punch. For awhile it looked as if he was gonna bring alot of attention to the lower divisions. I do remember his fight with Humberto Gonzalez where 'Little Hands of Stone' got off the canvas 2x to stretch Chiquita. After the fighter Carbajal said "he ain't got no heart"
I'm not sure where on Boxrec you are looking, but if you look under his record of bouts, he won the undisputed world title from Yoshio Shirai on November 26, 1954, and defended it successfully nine times before losing it to Pone Kingpetch on April 16, 1960. So his record as a titleholder was pretty good. Shirai, Leo Espinosa, Oscar Suarez, Dai Dower, Young Martin, and Sadao Yaoita were among his defenses and they were well respected fighters of the era. I note that my previous post understated Perez's accomplishments by quite a bit. As noted immediately above, he held the title for six years rather than four and defended it successfully nine times instead of six. Thanks for pushing me a little bit harder so I could set the record straight. Fighting Harada is definitely a great pick. Another person to consider was Benny Lynch of Scotland. For a short while, he was pretty heavy fisted.