I believe finding a normal kubfu is much easier although from personal experience I also believe finding a shiny mew is 10x easier than a normal kubfu........so its all rng.
Kubfu and Entei are both Legendary Pokémon, and appear at the same encounter rate. Variants, such as Metallic, are more rare then the standard Pokémon. Metallic Entei is therefore more rare than a standard Kubfu.
.thumb.jpeg.82ca7b1759d108e67cfcdd9acb061d22.jpeg)
.thumb.png.c50ae769ed44f982224599365a4225da.png)
.thumb.gif.ae156098c4dfab2f5c455db3984cb6bd.gif)
.thumb.jpg.f1995ff3ec6d795aeeda9cba5a377ef8.jpg)