Here's a picture guide for anyone interesting in seeing what exactly the leaders have, along with leader titles (Bulbapedia). Plus, names, types and highest stat.
Dento"Trial triangle." (Clever.)
Yorterrie (Normal; Attack), Yanappu (Grass; Speed)
Prize: Tri Badge, TM for Cheer Up, Pokemon up to Lv. 20 obey
Poddo(Reminds me of Barry and Buck.)
"Trial triangle."
Yorterrie (Normal; Attack), Baoppu (Fire; Speed)
Prize: Tri Badge, TM for Cheer Up, Pokemon up to Lv. 20 obey
Kon"Trial triangle."
Yorterrie (Normal; Attack), Hyappu (Water; Speed)
Prize: Tri Badge, TM for Cheer Up, Pokemon up to Lv. 20 obey
Aloe"Natural-born Mama." (Her son appears in the game.)
Harderia (Normal; Attack), Meerhog (Normal; Attack)
Prize: Basic Badge, TM for Get Even, Pokemon up to Lv. 30 obey
Arti"Most insect artist." (An artist? I'm beginning to like this character.)
Hoiiga (Bug/Poison; Defense), Ishizumai (Bug/Rock; Defense), Hahakomori (Bug/Grass; Attack)
Prize: Beetle Badge, TM for Bug Resistance, Pokemon up to Lv. 40 obey
Kamitsure"Shining beauty." (Even the game thinks she's hot.)
Emonga (Electric; Speed), Emonga (Electric; Speed), Zebraika (Electric; Speed)
Prize: Bolt Badge, TM for Volt Change, Pokemon up to Lv. 50 obey
Yakon"Underground boss." (Giovanni's and Clint Eastwood's hypothetical lovechild, seriously.)
Warubiru (Ground/Dark; Attack), Gamagaru (Water/Ground; Hit Points), Doryuuzu (Ground/Steel; Attack)
Prize: Quake Badge, TM for Smooth Over, Pokemon up to Lv. 60 obey
Furou(Is it wrong of me that one of the first things I notice from this picture is that this girl's got a big rack?)
"The heavens' surprising girl." (Perhaps she's an impulsive one who does bold things? Like wear hardly anything?)
Kokoromori (Psychic/Flying; Speed), Kenhorou (Normal/Flying; Attack), Swanna (Water/Flying; Speed)
Prize: Jet Badge, TM for Acrobat, Pokemon up to Lv. 70 obey
Hachiku"Ice mask." (The Mask of Ice is Pryce in the manga. Funny coincidence.)
Vaniricchi (Ice; Sp. Atk.), Freezio (Ice; Sp. Def.), Tsunbear (Ice; Attack)
Prize: Icicle Badge, TM for Ice Breath, Pokemon up to Lv. 80 obey
Iris (White)/Shaga (Black)Iris: "The girl who understands the hearts of dragons." (I like this title. I'll probably like Iris, too.)
Shaga: "Spartan mayor." (Spartan? ALERT! BAD
butt OLD MAN APPROACHING!)
Onondo (Dragon; Attack), Crimgan (Dragon; Attack), Ononokusu (Dragon; Attack)
Prize: Legend Badge,TM for Dragon Tail, all Pokemon obey