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Attachment Hideyoshi's perfect link with Chimchar, Monferno, and Infernape is a historical reference; the real-life Toyotomi Hideyoshi was often called "Saru", the Japanese word for "monkey", because he was said to have the physical features of one.
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Hanbei has the lowest Power stat of any Warlord, likely a reference to the real life Takenaka "Hanbei" Shigeharu, who suffered from tuberculosis, dying young because of the disease. In the ending of Hanbei's story, Spoiler:he even sounds like he may be sick.
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If Hideyoshi and Mitsuhide are on opposing sides during a banner battle (like in Viperia), the two have a special exchange of dialogue:
Hideyoshi: "We can't lose to Mitsuhide! We've got to get those banners first,(Pokemon)!"
Mitsuhide: "We shall not be defeated. Come, (Pokemon)."
This is likely a reference to the Battle of Yamazaki, in which the real life Akechi Mitsuhide and Toyotomi Hideyoshi fought against each other, after Mitsuhide had betrayed and murdered Oda Nobunaga.

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